View source for Diphthong

{{Short description|Combination of two adjacent vowel sounds}}
{{More citations needed|date=June 2019}}
{{Use dmy dates|date=August 2022}}
{{IPA notice}}
[[File:En-us-no highway cowboys.ogg|thumb|American English pronunciation of "no highway cowboys" /noʊ ˈhaɪweɪ ˈkaʊbɔɪz/, showing five diphthongs: {{IPAc-en|oʊ|,_|aɪ|,_|eɪ|,_|aʊ|,_|ɔɪ}}]]

A '''diphthong''' ({{IPAc-en|ˈ|d|ɪ|f|θ|ɒ|ŋ|,_|ˈ|d|ɪ|p|-}} {{respell|DIF|thong|,_|DIP|-}}),<ref>{{Cite dictionary |url=http://www.lexico.com/definition/diphthong |archive-url=https://web.archive.org/web/20210413175646/https://www.lexico.com/definition/diphthong |archive-date=13 April 2021 |title=diphthong |dictionary=[[Lexico]] UK English Dictionary |publisher=[[Oxford University Press]]}}</ref> also known as a '''gliding vowel''' or a '''vowel glide''', is a combination of two adjacent [[vowel]] sounds within the same [[syllable]].<ref>{{cite Merriam-Webster|diphthong}}</ref> Technically, a diphthong is a vowel with two different targets: that is, the tongue (and/or other parts of the [[speech organ|speech apparatus]]) moves during the pronunciation of the vowel. In most [[International Phonetic Alphabet chart for English dialects|varieties]] of [[English language|English]], the phrase "no highway cowboys" ({{IPAc-en|n|oʊ|_|ˈ|h|aɪ|w|eɪ|_|ˈ|k|aʊ|b|ɔɪ|z}} {{respell|noh|_|HY|way|_|KOW|boyz}}) has five distinct diphthongs, one in every [[syllable]].

Diphthongs contrast with [[monophthong]]s, where the tongue or other speech organs do not move and the syllable contains only a single vowel sound. For instance, in English, the word ''ah'' is spoken as a monophthong ({{IPAc-en|ɑː}}), while the word ''ow'' is spoken as a diphthong in most varieties ({{IPAc-en|aʊ}}). Where two adjacent vowel sounds occur in different syllables (e.g. in the English word ''re-elect'') the result is described as [[hiatus (linguistics)|hiatus]], not as a diphthong.

Diphthongs often form when separate vowels are run together in rapid speech during a conversation. However, there are also unitary diphthongs, as in the English examples above, which are heard by listeners as single-vowel sounds ([[phoneme]]s).<ref name=Sil>{{cite web |url=http://www.sil.org/linguistics/GlossaryOfLinguisticTerms/WhatIsADiphthong.htm |title=Definition of 'Diphthong' |publisher=[[SIL International]] |access-date=17 January 2008}}</ref>

The word comes {{etymology|grc|''δίφθογγος'' (díphthongos)|two sounds}}, {{etymology||''δίς'' (dís)|twice||''φθόγγος'' (phthóngos)|sound}}.

==Transcription==
In the [[International Phonetic Alphabet]] (IPA), monophthongs are transcribed with one symbol, as in English ''sun'' {{IPA|[sʌn]}}, in which {{angbr IPA|ʌ}} represents a monophthong. Diphthongs are transcribed with two symbols, as in English ''high'' {{IPA|/haɪ/}} or ''cow'' {{IPA|/kaʊ/}}, in which {{angbr IPA|aɪ}} and {{angbr IPA|aʊ}} represent diphthongs.

Diphthongs may be transcribed with two vowel symbols or with a vowel symbol and a [[semivowel]] symbol. In the words above, the less prominent member of the diphthong can be represented with the symbols for the palatal approximant {{IPAblink|j}} and the labiovelar approximant {{IPAblink|w}}, with the symbols for the close vowels {{IPAblink|i}} and {{IPAblink|u}}, or the symbols for the [[near-close vowel]]s {{IPAblink|ɪ}} and {{IPAblink|ʊ}}:

{| class="wikitable"
! vowel and semivowel
| {{angbr IPA|haj kaw}}
! rowspan="2" | [[Phonetic transcription#Narrow versus broad; phonemic versus phonetic|broad transcription]]
|-
! rowspan="2" | two vowel symbols
| {{angbr IPA|hai̯ kau̯}}
|-
| {{angbr IPA|haɪ̯ kaʊ̯}}
! [[Phonetic transcription#Narrow versus broad; phonemic versus phonetic|narrow transcription]]
|}

Some transcriptions are [[Broad transcription|broader]] or [[Narrow transcription|narrower]] (less precise or more precise phonetically) than others. Transcribing the English diphthongs in ''high'' and ''cow'' as {{angbr IPA|aj aw}} or {{angbr IPA|ai̯ au̯}} is a less precise or broader transcription, since these diphthongs usually end in a vowel sound that is [[Vowel#Height|more open]] than the semivowels {{IPA|[j w]}} or the [[close vowel]]s {{IPA|[i u]}}. Transcribing the diphthongs as {{angbr IPA|aɪ̯ aʊ̯}} is a more precise or narrower transcription, since the English diphthongs usually end in the [[near-close vowel]]s {{IPA|[ɪ ʊ]}}.

The non-syllabic [[diacritic]], the [[inverted breve]] below {{angbr|◌̯}},<ref>{{cite web|url=https://www.fileformat.info/info/unicode/char/032f/index.htm|title=Unicode Character 'COMBINING INVERTED BREVE BELOW' (U+032F)|website=FileFormat.Info}}</ref> is placed under the less prominent part of a diphthong to show that it is part of a diphthong rather than a vowel in a separate syllable: {{IPA|[aɪ̯ aʊ̯]}}. When there is no contrastive vowel sequence in the language, the diacritic may be omitted. Other common indications that the two sounds are not separate vowels are a superscript, {{angbr IPA|aᶦ aᶷ}},<ref>Used e.g. by {{Citation|last=Donaldson|first=Bruce C.|year=1993|title=A Grammar of Afrikaans|chapter=1. Pronunciation|publisher=[[Mouton de Gruyter]]|pages=8–9|isbn=3-11-013426-8|url={{GBurl|id=ftzioRvJzTUC}}}} The author states that the Afrikaans diphthongs {{IPA|/eə øə oə/}} can be transcribed {{IPA|/eᵊ øᵊ oᵊ/}}.</ref> or a tie bar, {{angbr IPA|a͡ɪ a͡ʊ}} or {{angbr IPA|a͜ɪ a͜ʊ}}.<ref>Used e.g. by {{Citation|last=Mangold|first=Max|author-link=Max Mangold|year=2005|title=Das Aussprachewörterbuch|publisher=Duden|edition=6th|pages=36–37|isbn=3-411-04066-1}}. The author transcribes the diphthongs {{angbr|ai au eu}} as {{IPA|[a͜i a͜u ɔ͜y]}}. However, on page 36, he admits that phonetically, {{IPA|[aɪ̯ aʊ̯ ɔʏ̯]}} are more precise symbols.</ref> The tie bar can be useful when it is not clear which symbol represents the syllable nucleus, or when they have equal weight.<ref>{{cite book|last=Battisti|first=Carlo|year=2000|orig-date=1938|title=Fonetica generale|location=Milano|publisher=Lampi di stampa (Hoepli)|page=224|isbn=88-488-0088-2}}</ref> Superscripts are especially used when an on- or off-glide is particularly fleeting.<ref>{{cite conference|first1=George D.|last1=Allen|first2=Sarah|last2=Hawkins|title=Development of Phonological Rhythm|editor-first1=Alan|editor-last1=Bell|editor-first2=Joan B.|editor-last2=Hooper|book-title=Syllables and Segments|series=North-Holland Linguistic Series|volume=40|conference=Symposium on Segment Organization and the Syllable, Boulder, Colorado, October 21–23, 1977|year=1978|publication-place=Amsterdam|publisher=North-Holland|pages=173–185|isbn=0-444-85241-7}} The authors contrast {{angbr IPA|oi}} from {{angbr IPA|o͜i}} from {{angbr IPA|oᶤ}}.</ref>

The period {{angbr IPA|.}} is the opposite of the non-syllabic diacritic: it represents a syllable break. If two vowels next to each other belong to two different [[syllable]]s ([[hiatus (linguistics)|hiatus]]), meaning that they do not form a diphthong, they can be transcribed with two vowel symbols with a period in between. Thus, ''lower'' can be transcribed {{angbr IPA|ˈloʊ.ɚ}}, with a period separating the first syllable, {{IPAc-en|l|oʊ}}, from the second syllable, {{angbr IPA|ɚ}}.

The non-syllabic diacritic is used only when necessary. It is typically omitted when there is no ambiguity, as in {{angbr IPA|haɪ kaʊ}}. No words in English have the vowel sequences {{IPA|*[a.ɪ a.ʊ]}}, so the non-syllabic diacritic is unnecessary.

==Types==

===Falling and rising===
'''Falling''' (or '''descending''') diphthongs start with a vowel quality of higher [[prominence (phonetics)|prominence]] (higher pitch or volume) and end in a semivowel with less prominence, like {{IPA|[aɪ̯]}} in ''eye'', while '''rising''' (or '''ascending''') diphthongs begin with a less prominent semivowel and end with a more prominent full vowel, similar to the {{IPA|[ja]}} in ''yard''. (Sometimes, however, the terms "falling" and "rising" are used, instead, to refer to [[vowel height]], i.e. as synonyms of the terms "closing" and "opening".<ref>{{cite book|last=Bussmann|first=Hadumod|year=2006|title=Routledge Dictionary of Language and Linguistics|translator-first1=Gregory|translator-last1=Trauth|translator-first2=Kerstin|translator-last2=Kassazi|chapter=Diphthong|url={{GBurl|id=O0-9Iw0Qh6EC|p=316}}|location=London/New York|publisher=Routledge|page=316|isbn=0-203-98005-0|access-date=24 March 2023}}</ref> See below.) The less prominent component in the diphthong may also be transcribed as an [[approximant]], thus {{IPA|[aj]}} in ''eye'' and {{IPA|[ja]}} in ''yard''. However, when the diphthong is analysed as a single [[phoneme]], both elements are often transcribed with vowel symbols ({{IPA|/aɪ̯/}}, {{IPA|/ɪ̯a/}}). Semivowels and approximants are not equivalent in all treatments, and in the [[English (language)|English]] and [[Italian (language)|Italian]] languages, among others, many [[phonetician]]s do not consider rising combinations to be diphthongs, but rather sequences of approximant and vowel. There are many languages (such as [[#Romanian|Romanian]]) that contrast one or more rising diphthongs with similar sequences of a glide and a vowel in their phonetic inventory<ref name="Chiorana">{{Harvcoltxt|Chițoran|2002a|p=203}}</ref> (see [[semivowel]] for examples).

===Closing, opening, and centering===
[[File:Belgian Dutch diphthongs chart.svg|thumb|upright=1.15|[[Vowel diagram]] illustrating closing diphthongs of Belgian Standard [[Dutch language|Dutch]], from {{Harvcoltxt|Verhoeven|2005|p=245}}]]
[[File:Orsmaal-Gussenhoven Dutch centering diphthongs chart.svg|thumb|upright=1.15|Vowel diagram illustrating centering diphthongs of the [[Dutch language|Dutch]] dialect of [[Orsmaal-Gussenhoven dialect|Orsmaal-Gussenhoven]], from {{Harvcoltxt|Peters|2010|p=241}}]]
In '''closing''' diphthongs, the second element is more [[close vowel|close]] than the first (e.g. {{IPA|[ai]}}); in '''opening''' diphthongs, the second element is more [[open vowel|open]] (e.g. {{IPA|[ia]}}). Closing diphthongs tend to be falling ({{IPA|[ai̯]}}), and opening diphthongs are generally rising ({{IPA|[i̯a]}}),<ref>{{Cite book|title=Dictionary of Linguistics and Phonetics|editor-last=Crystal|editor-first=David|location=Malden, MA|publisher=Blackwell|year=2008|chapter=diphthong|edition=6|isbn=978-1-4051-5297-6|url={{GBurl|id=6muoEAAAQBAJ|p=146}}|access-date=24 March 2023}}</ref> as open vowels are more [[sonorant|sonorous]] and therefore tend to be more prominent. However, exceptions to this rule are not rare in the world's languages. In [[Finnish phonology|Finnish]], for instance, the opening diphthongs {{IPA|/ie̯/}} and {{IPA|/uo̯/}} are true falling diphthongs, since they begin louder and with higher pitch and fall in prominence during the diphthong.

A third, rare type of diphthong that is neither opening nor closing is '''height-harmonic''' diphthongs, with both elements at the same vowel height.<ref>{{cite book|editor-first1=Richard M.|editor-last1=Hogg|editor-first2=Norman Francis|editor-last2=Blake|editor-link2=Norman Blake (academic)|editor-first3=Robert William|editor-last3=Burchfield|title=The Cambridge History of the English Language|location=Cambridge|publisher=Cambridge University Press|year=1992|volume=1|page=49|isbn=0-521-26475-8|url={{GBurl|id=UlD3ksfXl5IC|p=49}}|access-date=24 March 2023}}</ref> These may have occurred in [[Old English]]:
* ''beorht'' {{IPA|[beo̯rxt]}} "bright"
* ''ċeald'' {{IPA|[t͡ʃæɑ̯ld]}} "cold"

A '''centering''' diphthong is one that begins with a more peripheral vowel and ends with a more central one, such as {{IPA|[ɪə̯]}}, {{IPA|[ɛə̯]}}, and {{IPA|[ʊə̯]}} in [[Received Pronunciation]] or {{IPA|[iə̯]}} and {{IPA|[uə̯]}} in [[Irish language|Irish]]. Many centering diphthongs are also opening diphthongs ({{IPA|[iə̯]}}, {{IPA|[uə̯]}}).

Diphthongs may contrast in how far they open or close. For example, [[Samoan language|Samoan]] contrasts low-to-mid with low-to-high diphthongs:
* '''ai'' {{IPA|[ʔai̯]}} 'probably'
* '''ae'' {{IPA|[ʔae̯]}} 'but'
* '''auro'' {{IPA|[ʔau̯ɾo]}} 'gold'
* ''ao'' {{IPA|[ao̯]}} 'a cloud'

===Narrow and wide===
'''Narrow''' diphthongs are the ones that end with a vowel which on a vowel chart is quite close to the one that begins the diphthong, for example Northern Dutch {{IPA|[eɪ]}}, {{IPA|[øʏ]}} and {{IPA|[oʊ]}}. '''Wide''' diphthongs are the opposite – they require a greater tongue movement, and their offsets are farther away from their starting points on the vowel chart. Examples of wide diphthongs are RP/GA English {{IPA|[aɪ]}} and {{IPA|[aʊ]}}.

===Length===
Languages differ in the length of diphthongs, measured in terms of [[Mora (linguistics)|morae]]. In languages with phonemically short and long vowels, diphthongs typically behave like long vowels, and are pronounced with a similar length.<ref>{{Cite journal |last=Anderson |first=Catherine |date=2018-03-15 |title=2.8 Diphthongs |url=https://pressbooks.pub/essentialsoflinguistics/chapter/2-8-diphthongs/ |journal=Pressbooks |language=en }}</ref> In languages with only one phonemic length for pure vowels, however, diphthongs may behave like pure vowels.<ref>{{Cite journal |last1=Paschen |first1=Ludger |last2=Fuchs |first2=Susanne |last3=Seifart |first3=Frank |date=September 2022 |title=Final Lengthening and vowel length in 25 languages |journal=Journal of Phonetics |language=en |volume=94 |article-number=101179 |doi=10.1016/j.wocn.2022.101179|doi-access=free }}</ref> For example, in [[Icelandic language|Icelandic]], both monophthongs and diphthongs are pronounced long before single consonants and short before most consonant clusters.

Some languages contrast '''short''' and '''long''' diphthongs. In some languages, such as [[Old English]], these behave like short and long vowels, occupying one and two [[Mora (linguistics)|morae]], respectively. Languages that contrast three quantities in diphthongs are extremely rare, but not unheard of; [[Northern Sami]] is known to contrast long, short and "finally stressed" diphthongs, the last of which are distinguished by a longer second element.<ref name="Aikio 2022">{{Cite book |last1=Aikio |first1=Ante |title=The Oxford Guide to the Uralic Languages |last2=Ylikoski |first2=Jussi |date=2022 |publisher=Oxford University Press |isbn=9780191821516 |editor-last=Bakró-Nagy |editor-first=Marianne |pages=147–177 |chapter=North Saami |doi=10.1093/oso/9780198767664.003.0010 |editor-last2=Laakso |editor-first2=Johanna |editor-last3=Skribnik |editor-first3=Elena}}</ref>{{rp|149}}

==Phonology==
In some languages, diphthongs are single [[phoneme]]s, while in others they are analyzed as sequences of two vowels, or of a vowel and a semivowel.

==Sound changes==
Certain sound changes relate to diphthongs and [[monophthong]]s. [[Vowel breaking]] or diphthongization is a [[vowel shift]] in which a monophthong becomes a diphthong. [[Monophthongization]] or smoothing is a vowel shift in which a diphthong becomes a monophthong.

==Difference from semivowels and vowel sequences==

While there are a number of similarities, diphthongs are not the same phonologically as a combination of a vowel and an approximant or glide. Most importantly, diphthongs are fully contained in the syllable nucleus<ref>{{Harvcoltxt|Kaye|Lowenstamm|1984|p=139}}</ref><ref>{{Harvcoltxt|Schane|1995|p=588}}</ref> while a semivowel or glide is restricted to the syllable boundaries (either the [[syllable structure|onset or the coda]]). This often manifests itself phonetically by a greater degree of constriction,<ref>{{Harvcoltxt|Padgett|2007|p=1938}}</ref> but the phonetic distinction is not always clear.<ref>{{Harvcoltxt|Schane|1995|p=606}}</ref> The English word ''yes'', for example, consists of a palatal glide followed by a monophthong rather than a rising diphthong. In addition, the segmental elements must be different in diphthongs {{IPA|[ii̯]}} and so when it occurs in a language, it does not contrast with {{IPA|[iː]}}. However, it is possible for languages to contrast {{IPA|[ij]}} and {{IPA|[iː]}}.<ref>{{Harvcoltxt|Schane|1995|pp=589, 606}}</ref>

Diphthongs are also distinct from sequences of simple vowels. The [[Bunaq language]] of Timor, for example, distinguishes {{IPA|/sa͡i/ [saj]}} 'exit' from {{IPA|/sai/ [saʲi]}} 'be amused', {{IPA|/te͡i/ [tej]}} 'dance' from {{IPA|/tei/ [teʲi]}} 'stare at', and {{IPA|/po͡i/ [poj]}} 'choice' from {{IPA|/loi/ [loʷi]}} 'good'{{clarify|date=August 2025}}.<ref>{{cite book|first=Antoinette|last=Schapper|year=2017|title=The Papuan Languages of Timor, Alor and Pantar|location=Boston/Berlin|publisher=Walter de Gruyter|volume=2|page=20|isbn=978-1-61451-902-7|url={{GBurl|uWVCDwAAQBAJ|p=20}}|access-date=24 March 2023}}</ref>

Some languages or dialects also articulate the component sounds of a diphthong differently than when those sounds are produced in hiatus. For example, due to [[Canadian raising|English diphthong raising]], many North American English speakers pronounce {{IPA|/aɪ/}} with [[Vowel#Height|closer vowels]] than {{IPA|/a.ɪ/}}, and, among a subset of those, the diphthong {{IPA|/aʊ/}} may be similarly raised as compared to {{IPA|/a.ʊ/}}.

==Examples==

===Indo-European languages===

====English====
{{See also|International Phonetic Alphabet chart for English dialects}}

In words coming from [[Middle English]], most cases of the Modern English diphthongs {{IPA|[aɪ̯, oʊ̯, eɪ̯, aʊ̯]}} originate from the Middle English long monophthongs {{IPA|[iː, ɔː, aː, uː]}} through the [[Great Vowel Shift]], although some cases of {{IPA|[oʊ̯, eɪ̯]}} originate from the [[Middle English phonology#Diphthongs|Middle English diphthongs]] {{IPA|[ɔu̯, aɪ̯]}}.

{| class="wikitable"
|-
|+Standard English diphthongs
! rowspan="2"|
! rowspan="2"|English<br />[[diaphoneme]]
! rowspan="2"|[[Received Pronunciation|RP]] ([[British English|British]])
! rowspan="2"|[[Australian English|Australian]]
! rowspan="2"|[[South-West Irish English|S.W. Irish]]
! colspan="2"|North American
|-
! [[General American|GenAm]]
! [[Canadian English|Canadian]]
|- align="center"
|''l'''ow''''' || {{IPA|⫽oʊ⫽}} || {{IPA|[əʉ̯]}} || {{IPA|[ɜʉ̯ ~ ɐʉ̯]}} 
| {{IPA|[oː]}}|| colspan="2"| {{IPA|[o̞ʊ̯ ~ ʌʊ̯ ~ ɔʊ̯ ~ o̞]}}
|- align="center"
|''l'''ou'''d'' || rowspan="2"|{{IPA|⫽aʊ⫽}} || rowspan="2"|{{IPA|[aʊ̯]}} || rowspan="2"|{{IPA|[æɔ̯]}} 
|rowspan="2"|{{IPA|[ɐʊ̯ ~ ʌʊ̯]}}|| rowspan="2" |{{IPA|[aʊ̯ ~ æʊ̯]}}<ref group=t2 name=pitt>In [[Pittsburgh English]], {{IPA|/aʊ̯/}} is monophthongal {{IPA|[aː]}}, leading to the stereotypical spelling "Dahntahn" for "downtown".</ref>|| {{IPA|[aʊ̯ ~ æʊ̯]}}
|- align="center"
|''l'''ou'''t'' 
| {{IPA|[ʌʊ̯]}}<ref group="t2" name="ce1">Canadian English and some dialects of northern American English exhibit [[Allophone|allophony]] of {{IPA|/aʊ̯/}} and {{IPA|/aɪ̯/}} called [[Canadian raising]] – in some places they have become separate phonemes. GA has raising to a lesser extent in {{IPA|/aɪ̯/}}.</ref>
|- align="center"
|''l'''ie'''d'' || rowspan="2"| {{IPA|⫽aɪ⫽}} || rowspan="2"| {{IPA|[ɑ̈ɪ̯ ~ ʌ̞ɪ̯]}} ||rowspan="2" |{{IPA|[ɑ̟e̯ ~ ɑe̯]}} 
|rowspan="2"|{{IPA|[æɪ̯ ~ ɐɪ̯]}} || colspan="2"| {{IPA|[äɪ̯ ~ ɑɪ̯]}}<ref group=t2 name=sus>In several American dialects such as [[Southern American English]], {{IPA|/aɪ̯/}} becomes monophthongal [aː] except before voiceless consonants.</ref>
|- align="center"
|''l'''igh'''t'' 
| colspan="2" | {{IPA|[ʌɪ̯ ~ ɜɪ̯ ~ ɐɪ̯]}}<ref group=t2 name=ce1/>
|- align="center"
|''l'''ay''''' || {{IPA|⫽eɪ⫽}} || {{IPA|[e̞ɪ̯ ~ ɛɪ̯]}} || {{IPA|[æɪ̯ ~ ɐɪ̯]}} 
| {{IPA|[eː]}}|| colspan="2"| {{IPA|[eɪ̯ ~ e]}}
|- align="center"
|''l'''oi'''n'' || {{IPA|⫽ɔɪ⫽}} || {{IPA|[oɪ̯ ~ ɔ̝ɪ̯]}} || {{IPA|[oɪ̯]}} 
| {{IPA|[əɪ̯ ~ ɑɪ̯]}}|| colspan="2"| {{IPA|[ɔɪ̯ ~ oɪ̯]}}
|- align="center"
|''l'''oo'''n'' || {{IPA|⫽uː⫽}}<ref group=t2 name=md4>The erstwhile monophthongs {{IPA|/iː/}} and {{IPA|/uː/}} are diphthongized in many dialects. In many cases they might be better transcribed as {{IPA|[uu̯]}} and {{IPA|[ii̯]}}, where the non-syllabic element is understood to be closer than the syllabic element. They are sometimes transcribed {{IPA|/uw/}} and {{IPA|/ij/}}.</ref> || {{IPA|[ʊ̈ʉ̯ ~ ʉː ~ ɨ̞ɯ̯̈]}} || {{IPA|[ʊ̈ʉ̯]}} 
| {{IPA|[uː]}}|| {{IPA|[u̟ ~ ʊu̯ ~ ʉu̯ ~ ɵu̯]}} || {{IPA|[ʉu̯]}} 
|- align="center"
|''l'''ea'''n'' || {{IPA|⫽iː⫽}}<ref group=t2 name=md4/> || {{IPA|[ɪi̯ ~ iː]}} ||{{IPA|[ɪi̯ ~ əi̯]}} 
| {{IPA|[iː]}}|| colspan="2"| {{IPA|[ɪi̯ ~ i]}}
|- align="center"
|''l'''eer''''' || {{IPA|⫽ɪər⫽}} || {{IPA|[ɪ̞ː ~ ëː ~ ɪə̯]}} || {{IPA|[ɪə̯ ~ ɪː ~ iː ~ iə̯]}} 
| {{IPA|[iːɹ]}}|| colspan="2"| {{IPA|[ɪɹ ~ iɹ]}}
|- align="center"
|''l'''air''''' || {{IPA|⫽ɛər⫽}} || {{IPA|[ɛː ~ ɛə̯]}} ||{{IPA|[e̞ː ~ eː]}}
| {{IPA|[eːɹ]}}|| colspan="2" | {{IPA|[ɛɹ]}}
|- align="center"
|''l'''ure''''' || {{IPA|⫽ʊər⫽}} || {{IPA|[ɵː ~ ɤ̈ː, o̞ː]}} ||{{IPA|[ʊ̈ʉ̯ə, oː]}} 
| {{IPA|[uːɹ]}}|| colspan="2"| {{IPA|[ʊɹ ~ ɔɹ ~ oɹ]}}
|}
{{Reflist|group=t2}}

====Dutch====
{| class="wikitable"
|-
|+ Diphthongs of [[Dutch phonology|Dutch]]
!
! Netherlandic<ref>{{Harvcoltxt|Gussenhoven|1992|p=46}}</ref>
! Belgian<ref>{{Harvcoltxt|Verhoeven|2005|p=245}}</ref>
|-align=center
| ''[[wiktionary:zeis#Dutch|z''ei''s, ''ij''s]]'' || colspan=2|{{IPA|[ɛɪ̯]}}
|-align=center
|''[[wiktionary:ui#Dutch|''ui'']]'' || colspan=2|{{IPA|[œʏ̯]}}
|-align=center
|[[wiktionary:zout#Dutch|zout]], [[wiktionary:louw#Dutch|louw]]||{{IPA|[ɑʊ̯]}} || {{IPA|[ɔʊ̯]}}
|-align=center
|''[[wiktionary:leeuw#Dutch|l''eeuw'']]'' || colspan=2|{{IPA|[eːʊ̯]}}
|-align=center
|''[[wiktionary:nieuw#Dutch|n''ieuw'']]'' || colspan=2|{{IPA|[iʊ̯]}}
|-align=center
|''[[wiktionary:duw#Dutch|d''uw'']]'' || colspan=2|{{IPA|[yʊ̯]}}
|-align=center
|''[[wiktionary:dooi#Dutch|d''ooi'']]'' || colspan=2|{{IPA|[o:ɪ̯]}}
|-align=center
|''[[wiktionary:saai#Dutch|s''aai'']]'' || colspan=2|{{IPA|[a:ɪ̯]}}
|-align=center
|''[[wiktionary:loei#Dutch|l''oei'']]'' || colspan=2|{{IPA|[uɪ̯]}}
|-align=center
|''[[wiktionary:beet#Dutch|b''ee''t]]''<ref group=t1 name=t-one>{{IPA|[eɪ̯]}}, {{IPA|[øʏ̯]}}, and {{IPA|[oʊ̯]}} are normally pronounced as closing diphthongs except when preceding {{IPA|[ɾ]}} and even {{IPA|[ɫ]}}, in which case they are either centering diphthongs: {{IPA|[eə̯]}}, {{IPA|[øə̯]}}, and {{IPA|[oə̯]}} or are lengthened and monophthongized to {{IPA|[ɪː]}}, {{IPA|[ʏː]}}, and {{IPA|[ʊː]}}</ref> || {{IPA|[eɪ̯]}} || {{IPA|[eː]}}
|-align=center
|''[[wiktionary:neus#Dutch|n''eu''s]]''<ref group=t1 name=t-one/> ||{{IPA|[øʏ̯]}} || {{IPA|[øː]}}
|-align=center
|''[[wiktionary:boot#Dutch|b''o''ot]]''<ref group=t1 name=t-one/> ||{{IPA|[oʊ̯]}} || {{IPA|[oː]}}
|-align=center
|}
{{Reflist|group=t1}}

The dialect of Hamont (in [[Limburg (Belgium)|Limburg]]) has five centring diphthongs and contrasts long and short forms of {{IPA|[ɛɪ̯]}}, {{IPA|[œʏ̯]}}, {{IPA|[ɔʊ̯]}}, and {{IPA|[ɑʊ̯]}}.<ref>{{Harvcoltxt|Verhoeven|2007|p=221}}</ref>

====Afrikaans====
The [[Afrikaans phonology|Afrikaans]] language has its origin in Dutch but differs in many significant ways, including the use of diphthongs in the place of several non-diphthong Dutch double vowels, or double-vowels being pronounced differently.
Examples include:
*''ee'' as in leer
*''eu'' as in deur
*''ui'' as in buite

{| class="wikitable" style="text-align: center"
|+ Diphthong phonemes{{sfnp|Donaldson|1993|pp=2, 8–10}}{{sfnp|Lass|1987|pp=117–119}}
! rowspan="2" colspan="2" | Starting point
! colspan="3" | Ending point
|-
! [[Front vowel|Front]]
! [[Central vowel|Central]]
! [[Back vowel|Back]]
|-
! rowspan="2" | [[Closed vowel|Closed]]
! {{small|unrounded}}
| 
| 
| {{IPA|iʊ̯}}
|-
! {{small|rounded}}
| {{IPA|uɪ̯}}
| 
| 
|-
! rowspan="2" | [[Mid vowel|Mid]]
! {{small|unrounded}}
| {{IPA|əɪ̯}}
| {{IPA|ɪə}}
|
|-
! {{small|rounded}}
| {{IPA|œɪ̯, ɔɪ̯, oːɪ̯}}
| {{IPA|ʏə, ʊə}}
| {{IPA|œʊ̯}}
|-
! [[Open vowel|Open]]
! {{small|unrounded}}
| {{IPA|aɪ̯, ɑːɪ̯}}
|
|
|}

* Falling diphthongs. Their first element may be short {{IPA|[ɪə̯, ʊə̯]}} or somewhat lengthened {{IPA|[ɪˑə̯, ʊˑə̯]}}.{{sfnp|Lass|1987|pp=117–119}}
* Rising diphthongs {{IPA|[ɪ̯ə, ʊ̯ə]}}. These variants do not seem to appear word-finally. The sequence {{IPA|/ɦʊə/}} is commonly realised as {{IPA|[ɦʊ̯ə]}} or, more often, {{IPA|[ɦʊ̯ə̤]}}, with {{IPA|/ɦ/}} realised as [[breathy]]
* The scholar Daan Wissing argues that {{IPA|/əɪ̯/}} is not a phonetically correct transcription and that {{IPA|/æɛ̯/}} is more accurate. In his analysis, he found that {{IPA|[æɛ̯]}} makes for 65% of the realisations, the other 35% being monophthongal, {{IPAblink|ə}}, {{IPAblink|æ}} and {{IPAblink|ɛ}}.{{sfnp|Wissing|2009|p=333}}
* Most often, {{IPA|/œɪ̯/}} has an unrounded offset. For some speakers, the onset is also unrounded. That can cause {{IPA|/œɪ̯/}} to merge with {{IPA|/əɪ̯/}}, which is considered non-standard.{{sfnp|Donaldson|1993|p=10}}
* {{IPA|/ɔɪ̯, aɪ̯/}} occur mainly in loanwords.{{sfnp|Donaldson|1993|p=10}}
* Older sources describe {{IPA|/œu/}} as a narrow back diphthong {{IPA|[ou]}}.{{sfnp|Donaldson|1993|p=9}}{{sfnp|Swanepoel|1927|p=44}} However, newer sources describe its onset as more front. For example, {{Harvcoltxt|Lass|1984}}, states that the onset of {{IPA|/œu/}} is central {{IPA|[ɵu]}}.{{sfnp|Lass|1984|p=102}}
** In some words which, in English, are pronounced with {{IPA|/əʊ̯/}}, the Afrikaans equivalent tends to be pronounced with {{IPA|/œʊ̯/}}, rather than {{IPA|/ʊə/}}. That happens because Afrikaans {{IPA|/œʊ̯/}} is more similar to the usual South African realization of English {{IPA|/əʊ̯/}}.{{sfnp|Donaldson|1993|p=9}}

{| class="wikitable" style="text-align: center"
|+ Example words for diphthongs
! Phoneme
! IPA
! Orthography
! Gloss
|-
| {{IPA|/ɪø/}}
| {{IPA|/sɪøn/}}
| {{lang|af|seun}}
| 'son'
|-
| {{IPA|/əɪ̯/}}
| {{IPA|/ɦəɪ̯/}}
| {{lang|af|hy}}
| 'he'
|-
| {{IPA|/ɪə/}}
| {{IPA|/vɪət/}}
| {{lang|af|weet}}
| 'to know'
|-
| {{IPA|/œɪ̯/}}
| {{IPA|/ɦœɪ̯s/}}
| {{lang|af|huis}}
| 'house'
|-
| {{IPA|/ɔɪ̯/}}
| {{IPA|/ˈχɔɪ̯əŋ/}}
| {{lang|af|{{Not a typo|goiing}}}}
| 'burlap'
|-
| {{IPA|/ʊə/}}
| {{IPA|/brʊət/}}
| {{lang|af|brood}}
| 'bread'
|-
| {{IPA|/œʊ̯/}}
| {{IPA|/kœʊ̯t/}}
| {{lang|af|koud}}
| 'cold'
|-
| {{IPA|/aɪ̯/}}
| {{IPA|/ˈbaɪ̯ə/}}
| {{lang|af|baie}}
| 'many'
|}

The long diphthongs (or 'double vowels') are phonemically sequences of a free vowel and a non-syllabic equivalent of {{IPA|/i/}} or {{IPA|/u/}}: {{IPA|[iu, ui, oːi, eu, ɑːi]}}. Both {{IPA|[iu]}} and {{IPA|[eu]}} tend to be pronounced as {{IPA|[iu]}}, but they are spelled differently: the former as {{angbr|ieu}}, the latter as {{angbr|eeu}}.{{sfnp|Donaldson|1993|p=12}}

In diminutives ending in {{IPA|/ki/}} formed to monosyllabic nouns, the vowels {{IPA|/u, ɪə, ʊə, ɛ, ə, œ, ɔ, a, ɑː/}} are realised as closing diphthongs {{IPA|[ui, ei, oi, ɛi, əi, œi, ɔi, ai, ɑːi]}}. In the same environment, the sequences {{IPA|/ɛn, ən, œn, ɔn, an/}} are realized as {{IPA|[ɛiɲ, əiɲ, œiɲ, ɔiɲ, aiɲ]}}, i.e. as closing diphthongs followed by palatal nasal.{{sfnp|Donaldson|1993|pp=10–11}}

* The suffixes {{angbr|-aad}} and {{angbr|-aat}} (phonemically {{IPA|/ɑːd/}} and {{IPA|/ɑːt/}}, respectively) and the diminutive suffix {{IPA|/ki/}} are realised as {{IPA|[ɑːki]}} (with a monophthong), rather than {{IPA|[ɑːiki]}}.{{sfnp|Donaldson|1993|p=10}}
* In practice, the diphthong {{IPA|[əi]}} is realised the same as the phonemic diphthong {{IPA|/əi/}}.{{sfnp|Donaldson|1993|p=11}}
* {{IPA|[œi]}}, when it has arisen from diphthongisation of {{IPA|[œ]}}, differs from the phonemic diphthong {{IPA|/œi/}} by having a slightly different onset, although the exact nature of that difference is unclear. This means that {{lang|af|puntjie}} 'point' sounds somewhat different from {{lang|af|puintjie}} 'rubble'.{{sfnp|Donaldson|1993|p=11}}

====German====

=====Standard German=====
Phonemic diphthongs in [[German phonology|German]]:
*{{IPA|/aɪ̯/}} as in {{lang|de|Ei}} 'egg'
*{{IPA|/aʊ̯/}} as in {{lang|de|Maus}} 'mouse'
*{{IPA|/ɔʏ̯/}} as in {{lang|de|neu}} 'new'

In the varieties of German that [[Speech production|vocalize]] the {{IPA|/r/}} in the [[syllable coda]], other diphthongal combinations may occur. These are only phonetic diphthongs, not phonemic diphthongs, since the vocalic pronunciation {{IPA|[ɐ̯]}} alternates with consonantal pronunciations of {{IPA|/r/}} if a vowel follows, cf. {{lang|de|du hörst}} {{IPA|[duː ˈhøːɐ̯st]}} 'you hear' – {{lang|de|ich höre}} {{IPA|[ʔɪç ˈhøːʀə]}} 'I hear'. These phonetic diphthongs may be as follows:
[[File:German ɐ diphthongs chart - part 1.svg|thumb|upright=1.15|German diphthongs ending in {{IPA|[ɐ̯]|cat=no}} (part 1), from {{Harvcoltxt|Kohler|1999|p=88}}]]
[[File:German ɐ diphthongs chart - part 2.svg|thumb|upright=1.15|German diphthongs ending in {{IPA|[ɐ̯]|cat=no}} (part 2), from {{Harvcoltxt|Kohler|1999|p=88}}]]
{| class="wikitable" style="text-align: center;"
! colspan="2" | Diphthong
! colspan="3" | Example
|-
! Phonemically
! Phonetically
! IPA
! Orthography
! Translation
|-
| {{IPA|/iːr/}}
| {{IPA|[iːɐ̯]}}{{ref|1|1}}
| {{IPA|[viːɐ̯]}}
| {{lang|de|wir}}
| we
|-
| {{IPA|/yːr/}}
| {{IPA|[yːɐ̯]}}{{ref|1|1}}
| {{IPA|[fyːɐ̯]}}
| {{lang|de|für}}
| for
|-
| {{IPA|/uːr/}}
| {{IPA|[uːɐ̯]}}{{ref|1|1}}
| {{IPA|[ˈʔuːɐ̯laʊ̯pʰ]}}
| {{lang|de|<u>Ur</u>laub}}
| holiday
|-
| {{IPA|/ɪr/}}
| {{IPA|[ɪɐ̯]}}
| {{IPA|[vɪɐ̯tʰ]}}
| {{lang|de|wird}}
| he/she/it becomes
|-
| {{IPA|/ʏr/}}
| {{IPA|[ʏɐ̯]}}
| {{IPA|[ˈvʏɐ̯də]}}
| {{lang|de|W<u>ür</u>de}}
| dignity
|-
| {{IPA|/ʊr/}}
| {{IPA|[ʊɐ̯]}}
| {{IPA|[ˈvʊɐ̯də]}}
| {{lang|de|w<u>ur</u>de}}
| I/he/she/it became
|-
| {{IPA|/eːr/}}
| {{IPA|[eːɐ̯]}}{{ref|1|1}}
| {{IPA|[meːɐ̯]}}
| {{lang|de|mehr}}
| more
|-
| {{IPA|/øːr/}}
| {{IPA|[øːɐ̯]}}{{ref|1|1}}
| {{IPA|[høːɐ̯]}}
| {{lang|de|hör!}}
| (you) hear!
|-
| {{IPA|/oːr/}}
| {{IPA|[oːɐ̯]}}{{ref|1|1}}
| {{IPA|[tʰoːɐ̯]}}
| {{lang|de|Tor}}
| gate/goal (in football)
|-
| {{IPA|/ɛːr/}}
| {{IPA|[ɛːɐ̯]}}{{ref|1|1}}
| {{IPA|[bɛːɐ̯]}}
| {{lang|de|Bär}}
| bear
|-
| {{IPA|/ɛr/}}
| {{IPA|[ɛɐ̯]}}
| {{IPA|[ʔɛɐ̯ftʰ]}}
| {{lang|de|[[Erft]]}}
| Erft
|-
| {{IPA|/œr/}}
| {{IPA|[œɐ̯]}}
| {{IPA|[dœɐ̯tʰ]}}
| {{lang|de|dörrt}}
| he/she/it dries
|-
| {{IPA|/ɔr/}}
| {{IPA|[ɔɐ̯]}}
| {{IPA|[ˈnɔɐ̯dn̩]}}
| {{lang|de|N<u>or</u>den}}
| north
|-
| {{IPA|/aːr/}}
| {{IPA|[aːɐ̯]}}{{ref|1|1}}
| {{IPA|[vaːɐ̯]}}
| {{lang|de|wahr}}
| true
|-
| {{IPA|/ar/}}
| {{IPA|[aɐ̯]}}
| {{IPA|[haɐ̯tʰ]}}
| {{lang|de|hart}}
| hard
|}

:{{note|1|1}}{{Harvcoltxt|Wiese|1996}} notes that the length contrast is not very stable before non-prevocalic {{IPA|/r/}}<ref name="Wiese198">{{Harvcoltxt|Wiese|1996|p=198}}</ref> and that "{{Harvcoltxt|Meinhold|Stock|1980|p=180}}, following the pronouncing dictionaries ({{Harvcoltxt|Mangold|1990}}, {{Harvcoltxt|Krech|Stötzer|1982}}) judge the vowel in {{lang|de|Art}}, {{lang|de|Schwert}}, {{lang|de|Fahrt}} to be long, while the vowel in {{lang|de|Ort}}, {{lang|de|Furcht}}, {{lang|de|hart}} is supposed to be short. The factual basis of this presumed distinction seems very questionable."<ref name="Wiese198"/><ref>Also supported by {{Harvcoltxt|Tröster-Mutz|2011|p=20}}.</ref> He goes on stating that in his own dialect, there is no length difference in these words, and that judgements on vowel length in front of non-prevocalic {{IPA|/r/}} which is itself vocalized are problematic, in particular if {{IPA|/a/}} precedes.<ref name="Wiese198"/>

:According to the 'lengthless' analysis, the aforementioned 'long' diphthongs are analyzed as {{IPA|[iɐ̯]}}, {{IPA|[yɐ̯]}}, {{IPA|[uɐ̯]}}, {{IPA|[eɐ̯]}}, {{IPA|[øɐ̯]}}, {{IPA|[oɐ̯]}}, {{IPA|[ɛɐ̯]}} and {{IPA|[aɐ̯]}}. This makes non-prevocalic {{IPA|/aːr/}} and {{IPA|/ar/}} homophonous as {{IPA|[aɐ̯]}} or {{IPA|[aː]}}. Non-prevocalic {{IPA|/ɛːr/}} and {{IPA|/ɛr/}} may also merge, but the vowel chart in {{Harvcoltxt|Kohler|1999|p=88}} shows that they have somewhat different starting points.

:{{Harvcoltxt|Wiese|1996}} also states that "laxing of the vowel is predicted to take place in shortened vowels; it does indeed seem to go hand in hand with the vowel shortening in many cases."<ref name="Wiese198"/>

=====Bernese German=====
The diphthongs of some [[German dialects]] differ from standard German diphthongs. The [[Bernese German]] diphthongs, for instance, correspond rather to the [[Middle High German]] diphthongs than to standard German diphthongs:
*{{IPA|/iə̯/}} as in ''lieb'' 'dear'
*{{IPA|/uə̯/}} as in ''guet'' 'good'
*{{IPA|/yə̯/}} as in ''müed'' 'tired'
*{{IPA|/ei̯/}} as in ''Bei'' 'leg'
*{{IPA|/ou̯/}} as in ''Boum'' 'tree'
*{{IPA|/øi̯/}} as in ''Böim'' 'trees'

Apart from these phonemic diphthongs, Bernese German has numerous phonetic diphthongs due to [[L-vocalization]] in the syllable coda, for instance the following ones:
*{{IPA|[au̯]}} as in ''Stau'' 'stable'
*{{IPA|[aːu̯]}} as in ''Staau'' 'steel'
*{{IPA|[æu̯]}} as in ''Wäut'' 'world'
*{{IPA|[æːu̯]}} as in ''wääut'' 'elects'
*{{IPA|[ʊu̯]}} as in ''tschúud'' 'guilty'

==== Yiddish ====
[[Yiddish phonology|Yiddish]] has three diphthongs:<ref>{{Harvcoltxt|Kleine|2003|p=263}}</ref>
*{{IPA|[ɛɪ̯]}} as in {{IPA|[plɛɪ̯tə]}} פּליטה ('refugee' f.)
*{{IPA|[aɛ̯]}} as in {{IPA|[naɛ̯n]}} נײַן ('nine')
*{{IPA|[ɔə̯]}} as in {{IPA|[ɔə̯fn̩]}} אופֿן ('way')

Diphthongs may reach a higher target position (towards {{IPA|/i/}}) in situations of coarticulatory phenomena or when words with such vowels are being emphasized.

====Norwegian====
There are five diphthongs in the Oslo dialect of [[Norwegian phonology|Norwegian]], all of them falling:

*{{IPA|[æɪ]}} as in ''nei'', "no"
*{{IPA|[œʷʏʷ]}} as in ''øy'', "island"
*{{IPA|[æʉ͍]}} as in ''sau'', "sheep"
*{{IPA|[ɑɪ]}} as in ''hai'', "shark"
*{{IPA|[ɔʷʏʷ]}} as in ''joik'', "[[Joik|Sami song]]"

An additional diphthong, {{IPA|[ʉ͍ɪ]}}, occurs only in the word ''hui'' in the expression ''i hui og hast'' "in great haste". The number and form of diphthongs vary between dialects.

====Faroese====
Diphthongs in [[Faroese language|Faroese]] are:
*{{IPA|/ai/}} as in ''bein'' (can also be short)
*{{IPA|/au/}} as in ''havn''
*{{IPA|/ɛa/}} as in ''har'', ''mær''
*{{IPA|/ɛi/}} as in ''hey''
*{{IPA|/ɛu/}} as in ''nevnd''
*{{IPA|/œu/}} as in ''nøvn''
*{{IPA|/ʉu/}} as in ''hús''
*{{IPA|/ʊi/}} as in ''mín'', ''bý'', ''ið'' (can also be short)
*{{IPA|/ɔa/}} as in ''ráð''
*{{IPA|/ɔi/}} as in ''hoyra'' (can also be short)
*{{IPA|/ɔu/}} as in ''sól'', ''ovn''

====Icelandic====
Diphthongs in [[Icelandic phonology|Icelandic]] are the following:
*{{IPA|/au̯/}} as in {{lang|is|átta}}, "eight"
*{{IPA|/ou̯/}} as in {{lang|is|nóg}}, "enough"
*{{IPA|/øi̯/}} as in {{lang|is|auga}}, "eye"
*{{IPA|/ai̯/}} as in {{lang|is|kær}}, "dear"
*{{IPA|/ei̯/}} as in {{lang|is|þeir}}, "they"
*{{IPA|/ɔi/}} as in {{lang|is|koja}}, "bunk bed", "berth" (rare, only in handful of words)

Combinations of semivowel {{IPA|/j/}} and a vowel are the following:
*{{IPA|/jɛ/}} as in {{lang|is|éta}}, "eat"
*{{IPA|/ja/}} as in {{lang|is|jata}}, "manger"
*{{IPA|/jau̯/}} as in {{lang|is|já}}, "yes"
*{{IPA|/jo/}} as in {{lang|is|joð}}, "iodine", "jay", "yod" (only in a handful of words of foreign origin)
*{{IPA|/jou̯/}} as in {{lang|is|jól}}, "Christmas"
*{{IPA|/jœ/}} as in {{lang|is|jötunn}}, "giant"
*{{IPA|/jai̯/}} as in {{lang|is|jæja}}, "oh well"
*{{IPA|/ju/}} as in {{lang|is|jú}}, "yes"

====French====
In [[French phonology|French]], {{IPA|/wa/}}, {{IPA|/wɛ̃/}}, {{IPA|/ɥi/}} and {{IPA|/ɥɛ̃/}} may be considered true diphthongs (that is, fully contained in the syllable nucleus: {{IPA|[u̯a], [u̯ɛ̃], [y̯i], [y̯ɛ̃]}}). Other sequences are considered part of a glide formation process that turns a high vowel into a semivowel (and part of the syllable onset) when followed by another vowel.<ref>{{Harvcoltxt|Chițoran|2001|p=11}}</ref>

Diphthongs
* {{IPA|/wa/}} {{IPA|[u̯a]}} as in ''roi'' "king", ''coi'' "quiet", ''croix'' "cross", ''doigt'' "finger", ''droit'' "right", ''foi'' "faith", ''loi'' "law", ''proie'' "prey", ''soie'' "silk", ''toit'' "roof", ''voie'' "way", ''voix'' "voice"
* {{IPA|/wɛ̃/}} {{IPA|[u̯ɛ̃]}} as in ''groin'' "muzzle", ''coin'' "corner", ''coing'' "quince", ''foin'' "hay", ''moins'' "less", ''loin'' "far", ''point'' "point", ''poing'' "fist", ''soin'' "care"
* {{IPA|/ɥi/}} {{IPA|[y̯i]}} as in ''huit'' "eight", ''bruit'' "noise", ''buis'' "boxwood", ''fruit'' "fruit", ''fuite'' "leak", ''luire'' "glow", ''nuire'' "harm", ''nuit'' "night", ''pluie'' "rain", ''suite'' "continuation"
* {{IPA|/ɥɛ̃/}} {{IPA|[y̯ɛ̃]}} as in ''juin'' "June", ''suint'' "ooze (tar)"

Semivowels
* {{IPA|/wi/}} as in ''oui'' "yes"
* {{IPA|/jɛ̃/}} as in ''lien'' "bond"
* {{IPA|/jɛ/}} as in ''Ariège''
* {{IPA|/je/}} as in ''pied'' "foot"
* {{IPA|/ji/}} as in ''yin''
* {{IPA|/aj/}} as in ''travail'' "work"
* {{IPA|/ɛj/}} as in ''Marseille''
* {{IPA|/ij/}} as in ''bille'' "ball"
* {{IPA|/œj/}} as in ''feuille'' "leaf"
* {{IPA|/uj/}} as in ''grenouille'' "frog"
* {{IPA|/jø/}} as in ''vieux'' "old"

=====Quebec French=====
{{Main|Quebec French phonology}}
In [[Quebec French]], long vowels are generally diphthongized in informal speech when [[lexical stress|stressed]].

* {{IPA|[ɑɔ̯]}} as in ''tard'' "late"
* {{IPA|[aɛ̯]}} as in ''père'' "father"
* {{IPA|[aœ̯]}} as in ''fleur'' "flower"
* {{IPA|[ou̯]}} as in ''autre'' "other"
* {{IPA|[øy̯]}} as in ''neutre'' "neutral"
* {{IPA|[ãʊ̯̃]}} as in ''banque'' "bank"
* {{IPA|[ẽɪ̯̃]}} as in ''mince'' "thin"
* {{IPA|[ɒ̃ʊ̯̃]}} as in ''bon'' "well"
* {{IPA|[œ̃ʏ̯̃]}} as in ''un'' "one"

====Catalan====
[[Catalan phonology|Catalan]] possesses a number of phonetic diphthongs, all of which begin (''rising diphthongs'') or end (''falling diphthongs'') in {{IPA|[j]}} or {{IPA|[w]}}.<ref>{{Harvcoltxt|Carbonell|Llisterri|1992|p=54}}</ref>

{| class="wikitable"
|+Catalan diphthongs
|-
! colspan="6" | falling
|-
|{{IPA|[aj]}}||'''ai'''gua||'water'||{{IPA|[aw]}}||t'''au'''la||'table'
|-
|{{IPA|[əj]}}||m'''ai'''nada||'children'||{{IPA|[əw]}}||c'''au'''rem||'we will fall'
|-
|{{IPA|[ɛj]}}||rem'''ei'''||'remedy'||{{IPA|[ɛw]}}||p'''eu'''||'foot'
|-
|{{IPA|[ej]}}||r'''ei'''||'king'||{{IPA|[ew]}}||s'''eu'''||'his/her'
|-
|colspan="3"| ||{{IPA|[iw]}}||n'''iu''' ||'nest'
|-
|{{IPA|[ɔj]}}||n'''oi''' ||'boy'||{{IPA|[ɔw]}}||n'''ou''' ||'new'
|-
|colspan="3"| ||{{IPA|[ow]}}||j'''ou''' ||'yoke'
|-
|{{IPA|[uj]}}||av'''ui'''||'today' || {{IPA|[uw]}}||d'''uu'''||'he/she is carrying'
|-
! colspan="6" | rising
|-
|{{IPA|[ja]}}||'''ia'''ia||'grandma'|| {{IPA|[wa]}}||q'''ua'''tre||'four'
|-
|{{IPA|[jɛ]}}||ve'''ie'''m||'we see' || {{IPA|[wɛ]}}||seq'''üè'''ncia|| 'sequence'
|-
|{{IPA|[je]}}||se'''ie'''nt||'seat' ||{{IPA|[we]}}||ung'''üe'''nt ||'ointment'
|-
|{{IPA|[jə]}}||fe'''ia''' ||'he/she was doing' || {{IPA|[wə]}}||q'''üe'''stió ||'question'
|-
|colspan="3"| ||{{IPA|[wi]}}||ping'''üí'''||'penguin'
|-
|{{IPA|[jɔ]}}||'''io'''de||'iodine' || {{IPA|[wɔ]}}||q'''uo'''ta ||'payment'
|-
|{{IPA|[ju]}}||'''io'''gurt||'yoghurt' ||colspan="3"|
|}

In standard Eastern Catalan, rising diphthongs (that is, those starting with {{IPA|[j]}} or {{IPA|[w]}}) are possible only in the following contexts:<ref>{{cite book|chapter=Els diftongs, els triftongs i els hiats|title=Gramàtica de la llengua catalana|language=ca|edition=provisional draft|publisher=Institut d'Estudis Catalans|url=http://www2.iec.cat/institucio/seccions/Filologica/gramatica/fonetica/05diftongstriftongshiats.pdf|archive-url=https://web.archive.org/web/20100930153153/http://www2.iec.cat/institucio/seccions/Filologica/gramatica/fonetica/05diftongstriftongshiats.pdf |archive-date=30 September 2010}}</ref>
* {{IPAblink|j}} in word initial position, e.g. '''''i'''ogurt''.
* Both occur between vowels as in ''fe'''i'''a'' and ''ve'''i'''em''.
* In the sequences {{IPA|[ɡw]}} or {{IPA|[kw]}} and vowel, e.g. ''g'''u'''ant'', ''q'''u'''ota'', ''q'''ü'''estió'', ''ping'''ü'''í'' (these exceptional cases even lead some scholars<ref>e.g. {{Harvcoltxt|Lleó|1970}}, {{Harvcoltxt|Wheeler|1979}}</ref> to hypothesize the existence of rare labiovelar phonemes {{IPA|/ɡʷ/}} and {{IPA|/kʷ/}}).<ref>{{Harvcoltxt|Wheeler|2005|p=101}}</ref>

There are also certain instances of ''compensatory diphthongization'' in the [[Balearic Catalan|Majorcan]] dialect so that {{IPA|/ˈtroncs/}} ('logs') (in addition to deleting the palatal plosive) develops a compensating palatal glide and surfaces as {{IPA|[ˈtrojns]}} (and contrasts with the unpluralized {{IPA|[ˈtronʲc]}}). Diphthongization compensates for the loss of the palatal stop (part of Catalan's segment loss compensation). There are other cases where diphthongization compensates for the loss of point of articulation features (property loss compensation) as in {{IPA|[ˈaɲ]}} ('year') vs {{IPA|[ˈajns]}} ('years').<ref>{{Harvcoltxt|Mascaró|2001|pp=580–581}}</ref> The dialectal distribution of this compensatory diphthongization is almost entirely dependent on the dorsal plosive (whether it is velar or palatal) and the extent of consonant assimilation (whether or not it is extended to palatals).<ref>{{Harvcoltxt|Mascaró|2001|pp=581}}</ref>

====Portuguese====
{{Main|Portuguese phonology}}
The Portuguese diphthongs are formed by the [[labio-velar approximant]] {{IPA|[w]}} and [[palatal approximant]] {{IPA|[j]}} with a vowel,<ref>{{Harvcoltxt|Faria|2003|p=7}}</ref> [[European Portuguese]] has 14 phonemic diphthongs (10 oral and 4 nasal),<ref name="ReferenceB">{{Harvcoltxt|Cruz-Ferreira|1995|p=92}}</ref> all of which are falling diphthongs formed by a vowel and a nonsyllabic high vowel. [[Brazilian Portuguese]] has roughly the same amount, although the European and non-European dialects have slightly different pronunciations ({{IPA|[ɐj]}} is a distinctive feature of some southern and central Portuguese dialects, especially that of Lisbon). A {{IPA|[w]}} onglide after {{IPA|/k/}} or {{IPA|/ɡ/}} and before all vowels as in ''quando'' {{IPA|[ˈkwɐ̃du]}} ('when') or ''guarda'' {{IPA|[ˈɡwaɾðɐ ~ ˈɡwaʁdɐ]}} ('guard') may also form rising diphthongs and [[triphthong]]s. Additionally, in casual speech, adjacent heterosyllabic vowels may combine into diphthongs and triphthongs or even sequences of them.<ref name="ReferenceC">{{Harvcoltxt|Barbosa|Albano|2004|p=230}}</ref>
{| class="wikitable" style="text-align:center;"
|+Falling diphthongs of Portuguese
!colspan="6"|oral
|-
!
! [[European Portuguese|EP]]<ref name="ReferenceB"/>
! [[Brazilian Portuguese|BP]]
!
! [[European Portuguese|EP]]
! [[Brazilian Portuguese|BP]]
|-
|''sai''||colspan=2|{{IPA|[aj]}}||''mau''||colspan=2|{{IPA|[aw]}}
|-
|''sei''||{{IPA|[ɐj]/[ej]}} ||{{IPA|[ej]}}||''meu''||colspan=2|{{IPA|[ew]}}
|-
|''anéis''
| colspan="2" |{{IPA|[ɛj]}}||''véu''||colspan=2|{{IPA|[ɛw]}}
|-
|colspan="3"| ||''viu''||colspan=2|{{IPA|[iw]}}
|-
|''mói''||colspan=2|{{IPA|[ɔj]}}||colspan="3"|
|-
|''moita''||colspan=2|{{IPA|[oj]}}||''dou''||colspan=2|{{IPA|[ow]}}
|-
|''fui''||colspan=2|{{IPA|[uj]}}||colspan="3"|
|-
!colspan="6"|nasal
|-
|''mãe'' ||rowspan=2|{{IPA|[ɐ̃j]}}||{{IPA|[ɐ̃j]}}||''mão''||colspan=2|{{IPA|[ɐ̃w]}}
|-
|''cem'' ||{{IPA|[ẽj]}}||colspan="3"|
|-
|''anões''||colspan=2|{{IPA|[õj]}}||colspan="3"|
|-
|''muita''||colspan=2|{{IPA|[ũj]}}||colspan="3"|
|}

In addition, phonetic diphthongs are formed in most Brazilian Portuguese dialects by the [[L-vocalization|vocalization]] of {{IPA|/l/}} in the syllable coda with words like ''sol'' {{IPA|[sɔw]}} ('sun') and ''sul'' {{IPA|[suw]}} ('south') as well as by yodization of vowels preceding {{IPAslink|s}} or its allophone at syllable coda {{IPA|[{{IPAplink|ʃ}} ~ {{IPAplink|ɕ}}]}} in terms like ''arroz'' {{IPA|[aˈʁojs ~ ɐˈʁo(j)ɕ]}} ('rice'),<ref name="ReferenceC"/> and {{IPAslink|z}} (or {{IPA|[{{IPAplink|ʒ}} ~ {{IPAplink|ʑ}}]}}) in terms such as ''paz mundial'' {{IPA|[ˈpajz mũdʒiˈaw ~ ˈpa(j)ʑ mũdʑiˈaw]}} ('world peace') and ''dez anos'' {{IPA|[ˌdɛjˈz‿ɐ̃nu(j)s ~ ˌdɛjˈz‿ɐ̃nuɕ]}} ('ten years').

====Spanish====
Phonetically, [[Spanish phonology|Spanish]] has seven falling diphthongs and eight rising diphthongs. In addition, during fast speech, sequences of vowels in hiatus become diphthongs wherein one becomes non-syllabic (unless they are the same vowel, in which case they fuse together) as in ''poeta'' {{IPA|[ˈpo̯eta]}} ('poet'), ''almohada'' {{IPA|[alˈmo̯aða]}} ('pillow'), ''maestro'' {{IPA|[ˈmae̯stɾo]}} ('teacher') and ''línea'' {{IPA|[ˈline̯a]}} ('line'). The Spanish diphthongs are:<ref>{{Harvcoltxt|Martínez-Celdrán|Fernández-Planas|Carrera-Sabaté|2003|p=256}}</ref><ref>{{cite book|title=Introducción a la lingüística española|last=Azevedo|first=Milton Mariano|year=2004|publisher=Pearson Prentice Hall|edition=2|language=es|location=Upper Saddle River, NJ|isbn=0-13-110959-6|page=58|url={{GBurl|id=rctiAAAAMAAJ|q=diptongo|p=58}}|access-date=24 March 2023}}</ref>
{| class="wikitable"
|+ Spanish diphthongs
! colspan="6" | falling
|-
|{{IPA|[ai̯]}}||''aire''||'air'||{{IPA|[au̯]}}||''pausa''||'pause'
|-
|{{IPA|[ei̯]}} || ''rey''||'king'||{{IPA|[eu̯]}}||''neutro''||'neutral'
|-
|{{IPA|[oi̯]}} || ''hoy''||'today'||{{IPA|[ou̯]}}||''bou''||'[[seine fishing]]'
|-
|{{IPA|[ui̯]}} || ''muy''||'very'||colspan="3"|
|-
! colspan="6" | rising
|-
|{{IPA|[ja]}}||''hacia''||'towards'||{{IPA|[wa]}}||''cuadro''||'picture'
|-
|{{IPA|[je]}}||''tierra''||'earth'||{{IPA|[we]}}||''fuego''||'fire'
|-
|colspan="3"| ||{{IPA|[wi]}}||''fuimos''||'we went'
|-
|{{IPA|[jo]}}||''radio''||'radio'||{{IPA|[wo]}}||''cuota''||'quota'
|-
|{{IPA|[ju]}}||''viuda''||'widow'||colspan="3"|
|}

====Italian====
The existence of true diphthongs in Italian is debated; however, a list is:<ref>{{Harvcoltxt|Bertinetto|Loporcaro|2005|p=138}}</ref>
{| class="wikitable"
|+Italian diphthongs
!colspan="6"|falling
|-
|{{IPA|[ai̯]}}||''baita''||'mountain hut'||{{IPA|[au̯]}}||''auto''||'car'
|-
|{{IPA|[ei̯]}}||''potei''||'I could' (past tense)||{{IPA|[eu̯]}}||''pleurite''||'[[pleurisy]]'
|-
|{{IPA|[ɛi̯]}}||''sei''||'six'||{{IPA|[ɛu̯]}}||''neutro''||'neuter'
|-
|{{IPA|[ɔi̯]}}||''poi''||'later'||colspan="3"|
|-
|{{IPA|[oi̯]}}||''voi''||'you' (pl.)||colspan="3"|
|-
|{{IPA|[ui̯]}}||''lui''||'he'||colspan="3"|
|-
!colspan="6"|rising
|-
|{{IPA|[ja]}}||''chiave''||'key'||{{IPA|[wa]}}||''guado''||'ford'
|-
|{{IPA|[jɛ]}}||''pieno''||'full'||{{IPA|[wɛ]}}||''quercia''||'oak'
|-
|{{IPA|[je]}}||''soffietto''||'bellows'||{{IPA|[we]}}||''quello''||'that'
|-
|colspan="3"| ||{{IPA|[wi]}}||''guida''||'guide'
|-
|{{IPA|[jɔ]}}||''chiodo''||'nail'||{{IPA|[wɔ]}}||''quota''||'quota'
|-
|{{IPA|[jo]}}||''fiore''||'flower'||{{IPA|[wo]}}||''acquoso''||'watery'
|-
|{{IPA|[ju]}}||''piuma''||'feather'||colspan="3"|
|}

The second table includes only 'false' diphthongs, composed of a semivowel + a vowel, not two vowels. The situation is more nuanced in the first table: a word such as 'baita' is actually pronounced ['baj.ta] and most speakers would syllabify it that way. A word such as 'voi' would instead be pronounced and syllabified as ['vo.i], yet again without a diphthong.

In general, unstressed {{IPA|/i e o u/}} in [[Hiatus (linguistics)|hiatus]] can turn into glides in more rapid speech (e.g. ''biennale'' {{IPA|[bi̯enˈnaːle]}} 'biennial'; ''coalizione'' {{IPA|[ko̯alitˈtsi̯oːne]}} 'coalition') with the process occurring more readily in syllables further from stress.<ref>{{Harvcoltxt|Bertinetto|Loporcaro|2005|p=139}}</ref>

====Romanian====
{{Main|Romanian phonology}}
Romanian has two true diphthongs: {{IPA|/e̯a/}} and {{IPA|/o̯a/}}. There are, however, a host of other vowel combinations (more than any other major Romance language) which are classified as vowel glides. As a result of their origin (diphthongization of mid vowels under stress), the two true diphthongs appear only in stressed syllables<ref>{{Harvcoltxt|Chițoran|2002a|p=204}}</ref> and make [[#Vowel alternations|morphological alternations]] with the mid vowels {{IPA|/e/}} and {{IPA|/o/}}. To native speakers, they sound very similar to {{IPA|/ja/}} and {{IPA|/wa/}} respectively.<ref>{{Harvcoltxt|Chițoran|2002a|p=206}}</ref> There are no perfect [[minimal pair]]s to contrast {{IPA|/o̯a/}} and {{IPA|/wa/}},<ref name="Chiorana" /> and because {{IPA|/o̯a/}} does not appear in the final syllable of a prosodic word, there are no monosyllabic words with {{IPA|/o̯a/}}; exceptions might include ''voal'' ('veil') and ''trotuar'' ('sidewalk'), though Ioana Chițoran argues<ref>{{Harvcoltxt|Chițoran|2002b|p=217}}</ref> that these are best treated as containing glide-vowel sequences rather than diphthongs. In addition to these, the semivowels {{IPA|/j/}} and {{IPA|/w/}} can be combined (either before, after, or both) with most vowels, while this arguably<ref>See {{Harvcoltxt|Chițoran|2001|pp=8–9}} for a brief overview of the views regarding Romanian semivowels</ref> forms additional diphthongs and [[triphthong]]s, only {{IPA|/e̯a/}} and {{IPA|/o̯a/}} can follow an obstruent-liquid cluster such as in ''broască'' ('frog') and ''dreagă'' ('to mend'),<ref>{{Harvcoltxt|Chițoran|2002b|p=213}}</ref> implying that {{IPA|/j/}} and {{IPA|/w/}} are restricted to the syllable boundary and therefore, strictly speaking, do not form diphthongs.

====Irish====
All [[Irish phonology|Irish]] diphthongs are falling.
*{{IPA|[əi̯]}}, spelled ''aigh, aidh, agh, adh, eagh, eadh, eigh,'' or ''eidh''
*{{IPA|[əu̯]}}, spelled ''abh, amh, eabh,'' or ''eamh''
*{{IPA|[iə̯]}}, spelled ''ia, iai''
*{{IPA|[uə̯]}}, spelled ''ua, uai''

====Scottish Gaelic====
There are 9 diphthongs in [[Scottish Gaelic]]. Group 1 occur anywhere (''eu'' is usually {{IPA|[eː]}} before ''-m'', e.g. ''Seumas''). Group 2 are reflexes that occur before ''-ll, -m, -nn, -bh, -dh, -gh'' and ''-mh''.

{| class="wikitable"
|-
! width="30" |
! width="50" |
! width="70"|Spellings
! width="300"|Examples
|- align="center"
| rowspan="3" | 1
| {{IPA|[iə]}}
| ''ia''
| align="left"|''iarr'' "ask"
|- align="center"
| {{IPA|[uə]}}
| ''ua''
| align="left"|''fuar'' "cold"
|- align="center"
| {{IPA|[ia]}}
| ''eu''
| align="left"|''beul'' "mouth"
|- align="center"
| rowspan="6" | 2
| {{IPA|[ai]}}
| ''ai''
| align="left"|''saill'' "grease", ''cainnt'' "speech", ''aimhreit'' "riot"
|- align="center"
| {{IPA|[ei]}}
| ''ei''
| align="left"|''seinn'' "sing"
|- align="center"
| {{IPA|[ɤi]}}
| ''oi'', ''ei'', ''ai''
| align="left"|''loinn'' "badge", ''greim'' "bite", ''saighdear'' "soldier"
|- align="center"
| {{IPA|[ɯi]}}
| ''ui, aoi''
| align="left"|''druim'' "back", ''aoibhneas'' "joy"
|- align="center"
| {{IPA|[au]}}
| ''a, ea''
| align="left"|''cam'' "crooked", ''ceann'' "head"
|- align="center"
| {{IPA|[ɔu]}}
| ''o''
| align="left"|''tom'' "mound", ''donn'' "brown"
|}

For more detailed explanations of Gaelic diphthongs see [[Scottish Gaelic orthography]].

====Cornish====
The following diphthongs are used in the [[Standard Written Form]] of [[Cornish language|Cornish]]. Each diphthong is given with its ''Revived Middle Cornish'' (RMC) and ''Revived Late Cornish'' (RLC) pronunciation.

{| class="wikitable"
|-
! width="50"|Graph
! width="50"|RMC
! width="50"|RLC
! width="150"|Example
|- align="center"
| '''aw'''
| {{IPA|[aʊ]}}
| {{IPA|[æʊ]}}
| align="left"|''glaw'' "rain"
|- align="center"
| '''ay'''
| {{IPA|[aɪ]}}
| {{IPA|[əɪ]}}
| align="left"|''bay'' "kiss"
|- align="center"
| '''ew'''
| colspan="2"|{{IPA|[ɛʊ]}}
| align="left"|''blew'' "hair"
|- align="center"
| '''ey'''
| {{IPA|[ɛɪ]}}
| {{IPA|[əɪ]}}
| align="left"|''bleydh'' "wolf"
|- align="center"
| '''iw'''
| {{IPA|[iʊ]}}
| {{IPA|[ɪʊ]}}
| align="left"|''liw'' "colour"
|- align="center"
| '''ow'''
| colspan="2"|{{IPA|[ɔʊ]}}
| align="left"|''lowen'' "happy"
|- align="center"
| '''oy'''
| colspan="2"|{{IPA|[ɔɪ]}}
| align="left"|''moy'' "more"
|- align="center"
| '''uw'''
| {{IPA|[yʊ]}}
| {{IPA|[ɪʊ]}}
| align="left"|''duw'' "god"
|- align="center"
| '''yw'''
| {{IPA|[ɪʊ]}}
| {{IPA|[ɛʊ]}}
| align="left"|''byw'' "alive"
|}

====Welsh====
[[Welsh language|Welsh]] is traditionally divided into Northern and Southern dialects. In the north, some diphthongs may be short or long according to regular vowel length rules but in the south they are always short (see [[Welsh phonology]]). Southern dialects tend to simplify diphthongs in speech (e.g. {{lang|cy|gwaith}} {{IPA|/ɡwaiθ/}} is reduced to {{IPA|/ɡwaːθ/}}).
{| class="wikitable"
! width="50"|Grapheme
! width="75"|North
! width="75"|South
! width="150"|Example
|-
| '''ae'''
| {{IPA|/ɑːɨ/}}
|rowspan=3| {{IPA|/ai/}}
| ''maen'' 'stone'
|-
| '''ai'''
| {{IPA|/ai/}}
| ''gwaith'' 'work'
|-
| '''au'''†
| {{IPA|/aɨ/}}
| ''haul'' 'sun'
|-
| '''aw'''
| {{IPA|/au, ɑːu/}}
| {{IPA|/au/}}
| ''mawr'' 'big'
|-
| '''ei'''
| {{IPA|/əi/}}
|rowspan=3| {{IPA|/əi/}}
| ''gweithio'' 'to work'
|-
| '''eu'''
|rowspan=2| {{IPA|/əɨ/}}
| ''treulio'' 'spend'
|-
| '''ey'''
| ''teyrn'' 'tyrant'
|-
| '''ew'''
| {{IPA|/ɛu, eːu/}}
| {{IPA|/ɛu/}}
| ''tew'' 'fat'
|-
| '''oe'''
|rowspan=2| {{IPA|/ɔɨ, ɔːɨ/}}
|rowspan=3| {{IPA|/ɔi/}}
| ''moel'' 'bald'
|-
| '''ou'''
| ''cyffrous'' 'excited'
|-
| '''oi'''
| {{IPA|/ɔi/}}
| ''troi'' 'turn'
|-
| '''ow'''
| {{IPA|/ɔu, oːu/}}
| {{IPA|/ɔu/}}
| ''brown'' 'brown'
|-
| '''wy'''
| {{IPA|/ʊɨ, uːɨ/}}
| {{IPA|/ʊi/}}
| ''pwyll'' 'sense'
|-
| '''iw'''
| {{IPA|/ɪu/}}
|rowspan=3| {{IPA|/ɪu/}}
| ''lliw'' 'colour'
|-
| '''uw'''
|rowspan=2| {{IPA|/ɨu/}}
| ''duw'' 'god'
|-
|rowspan=2| '''yw'''
| ''llyw'' 'rudder'
|-
| {{IPA|/əu/}}
| {{IPA|/əu/}}
| ''tywydd'' 'weather'
|}
:† The plural ending {{lang|cy|-au}} is reduced to {{IPA|/a/}} in the north and {{IPA|/e/}} in the south, e.g. {{lang|cy| cadau}} 'battles' is {{IPA|/ˈkada/}} (north) or {{IPA|/ˈkade/}} (south).

====Czech====
There are three diphthongs in [[Czech phonology|Czech]]:

*{{IPA|/aʊ̯/}} as in ''auto'' (almost exclusively in words of foreign origin)
*{{IPA|/eʊ̯/}} as in ''euro'' (in words of foreign origin only)
*{{IPA|/oʊ̯/}} as in ''koule''

The vowel groups ''ia, ie, ii, io'', and ''iu'' in foreign words are not regarded as diphthongs, they are pronounced with {{IPA|/j/}} between the vowels {{IPA|[ɪja, ɪjɛ, ɪjɪ, ɪjo, ɪju]}}.

====Serbo-Croatian====
*{{lang|sh|italic=no|i(j)e}}, as in {{lang|sh|mlijeko}}<ref>{{cite news|url=http://www.vjesnik.hr/html/1999/05/11/nunu.htm|title=Babić ne zagovara korijenski pravopis, nego traži da Hrvati ne piju mlijeko nego - mlieko|work=Vjesnik|language=hr|archive-url=https://archive.today/20001121044500/http://www.vjesnik.hr/html/1999/05/11/nunu.htm|date=10 May 1999|location=Zagreb|archive-date=21 November 2000}}</ref> (in Ijekavian varieties)
may be pronounced as a diphthong, but also as {{IPA|[ie]}} in hiatus or separated by a semivowel, {{IPA|[ije]}}. For example, in the first line of the [[national anthem of Croatia]], ''Lijepa naša domovina'', ''ije'' is pronounced as a diphthong, but in the first line of the [[national anthem of Montenegro]], ''Oj, svijetla majska zoro'', ''ije'' is pronounced as two syllables.

Some [[Serbo-Croatian phonology|Serbo-Croatian]] dialects also have ''uo'', as in {{lang|sh|kuonj, ruod, uon}}<ref>{{cite journal |language=hr |url=http://www.matica.hr/Kolo/kolo0302.nsf/AllWebDocs/lisac1 |journal=[[Kolo (magazine)|Kolo]] |first=Josip|last=Lisac |title=Štokavsko narječje: prostiranje i osnovne značajke |archive-url=https://web.archive.org/web/20080217013643/http://www.matica.hr/Kolo/kolo0302.nsf/AllWebDocs/lisac1 |archive-date=17 February 2008 }}</ref> whereas, in Standard Croatian and Serbian, these words are konj, rod, on.

===Uralic languages===

====Estonian====
{{Main|Estonian phonology}}

All nine vowels can appear as the first component of an Estonian diphthong, but only {{IPA|[ɑ e i o u]}} occur as the second component.

{| class="wikitable"
|+Common Estonian diphthongs
|-
|colspan="2"| ||{{IPA|[ɑe]}}||''aed''<br />"fence, garden"||{{IPA|[ɑi]}}||''lai''<br />"wide"||{{IPA|[ɑo]}}||''kaotama''<br />"to lose"||{{IPA|[ɑu]}}||''laud''<br />"table"
|-
|{{IPA|[eɑ]}}||''teadma''<br />"to know"||colspan="2"| ||{{IPA|[ei]}}||''leib''<br />"bread"||{{IPA|[eo]}}||''teostus''<br />"accomplishment"||{{IPA|[iu]}}||''kiuste''<br />"in spite of"
|-
|{{IPA|[oɑ]}}||''toa''<br />"room"<br />(s. possessive)||{{IPA|[oe]}}||''koer''<br />"dog"||{{IPA|[oi]}}||''toit''<br />"food"||colspan="2"| ||colspan="2"|
|-
|colspan="2"| ||colspan="2"| ||{{IPA|[ui]}}||''kui''<br />"when, if"||colspan="2"| ||colspan="2"|
|-
|{{IPA|[ɤɑ]}}||''lõa''<br />"tether"<br />(s. possessive)||{{IPA|[ɤe]}}||''nõel''<br />"needle"||{{IPA|[ɤi]}}||''õige''<br />"right, correct"||{{IPA|[ɤo]}}||''tõotus''<br />"promise"||{{IPA|[ɤu]}}||''lõug''<br />"chin"
|-
|colspan="2"| ||{{IPA|[æe]}}||''päev''<br />"day"||{{IPA|[æi]}}||''täis''<br />"full"||{{IPA|[æo]}}||''näo''<br />"face" (s. possessive)||{{IPA|[æu]}}||''näuguma''<br />"to meow"
|-
|colspan="2"| ||{{IPA|[øe]}}||''söed''<br />"coals"||{{IPA|[øi]}}||''köis''<br />"rope"||colspan="2"| ||colspan="2"|
|}

There are additional diphthongs less commonly used, such as {{IPA|[eu]}} in Euroopa (Europe), {{IPA|[øɑ]}} in söandama (to dare), and {{IPA|[æu]}} in näuguma (to mew).

====Finnish====
{{Main|Finnish phonology}}
All [[Finnish language|Finnish]] [[Finnish phonology#Diphthongs|diphthongs]] are falling. Notably, Finnish has true opening diphthongs (e.g. {{IPA|/uo/}}), which are not very common crosslinguistically compared to centering diphthongs (e.g. {{IPA|/uə/}} in English). Vowel combinations across syllables may in practice be pronounced as diphthongs, when an intervening consonant has elided, as in ''näön'' {{IPA|[næøn]}} instead of {{IPA|[næ.øn]}} for the genitive of ''näkö'' ('sight').
; closing
*{{IPA|[ɑi̯]}} as in ''laiva'' (ship)
*{{IPA|[ei̯]}} as in ''keinu'' (swing)
*{{IPA|[oi̯]}} as in ''poika'' (boy)
*{{IPA|[æi̯]}} as in ''äiti'' (mother)
*{{IPA|[øi̯]}} as in ''öisin'' (at nights)
*{{IPA|[ɑu̯]}} as in ''lauha'' (mild)
*{{IPA|[eu̯]}} as in ''leuto'' (mild)
*{{IPA|[ou̯]}} as in ''koulu'' (school)
*{{IPA|[ey̯]}} as in ''leyhyä'' (to waft)
*{{IPA|[æy̯]}} as in ''täysi'' (full)
*{{IPA|[øy̯]}} as in ''löytää'' (to find)
; close
*{{IPA|[ui̯]}} as in ''uida'' (to swim)
*{{IPA|[yi̯]}} as in ''lyijy'' (lead)
*{{IPA|[iu̯]}} as in ''viulu'' (violin)
*{{IPA|[iy̯]}} as in ''siistiytyä'' (to smarten up)
; opening
*{{IPA|[ie̯]}} as in ''kieli'' (tongue)
*{{IPA|[uo̯]}} as in ''suo'' (bog)
*{{IPA|[yø̯]}} as in ''yö'' (night)

====Northern Sami====
The diphthong system in [[Northern Sami#Phonology|Northern Sami]] varies considerably from one dialect to another. The Western Finnmark dialects distinguish four different qualities of opening diphthongs:

*{{IPA|/eæ/}} as in ''leat'' "to be"
*{{IPA|/ie/}} as in ''giella'' "language"
*{{IPA|/oa/}} as in ''boahtit'' "to come"
*{{IPA|/uo/}} as in ''vuodjat'' "to swim"

In terms of quantity, Northern Sami shows a three-way contrast between '''long''', '''short''' and '''finally stressed''' diphthongs. The last are distinguished from long and short diphthongs by a markedly long and stressed second component. Diphthong quantity is not indicated in spelling.<ref name="Aikio 2022" />{{rp|148–149}} <ref>{{Cite book |last=Sammallahti |first=Pekka |title=The Saami Languages: An Introduction |date=1998 |publisher=Davvi Girji |location=Kárášjohka |isbn=82-7374-398-5 |pages=40–41}}</ref>

===Semitic languages===

====Maltese====
[[Maltese language|Maltese]] has seven falling diphthongs, though they may be considered VC sequences phonemically.<ref>{{Harvcoltxt|Borg|Azzopardi-Alexander|1997|p=299}}</ref>

*{{IPA|[ɛɪ̯]}} ''ej'' or ''għi''
*{{IPA|[ɐɪ̯]}} ''aj'' or ''għi''
*{{IPA|[ɔɪ̯]}} ''oj''
*{{IPA|[ɪʊ̯]}} ''iw''
*{{IPA|[ɛʊ̯]}} ''ew''
*{{IPA|[ɐʊ̯]}} ''aw'' or ''għu''
*{{IPA|[ɔʊ̯]}} ''ow'' or ''għu''

===Sino-Tibetan languages===

====Mandarin Chinese====
Rising sequences in [[Standard Mandarin|Mandarin]] are usually regarded as a combination of a medial semivowel ({{IPA|[j], [w], or [ɥ]}}) plus a vowel, while falling sequences are regarded as one diphthong.

* {{lang|cmn-Latn|ai}}: {{IPA|[ai̯]}}, as in {{lang|cmn|愛}} {{lang|cmn-Latn|ài}} ({{gloss|love}})
* {{lang|cmn-Latn|ao}}: {{IPA|[au̯]}}, as in {{lang|cmn|道}} {{lang|cmn-Latn|dào}} ({{gloss|way}})
* {{lang|cmn-Latn|ei}}: {{IPA|[ei̯]}}, as in {{lang|cmn|累}} {{lang|cmn-Latn|lèi}} ({{gloss|tired}})
* {{lang|cmn-Latn|ou}}: {{IPA|[ou̯]}}, as in {{lang|cmn|豆}} {{lang|cmn-Latn|dòu}} ({{gloss|bean}})

====Cantonese====
[[Cantonese]] has eleven falling diphthongs.

* {{lang|yue-Latn|aai}}: {{IPA|[aːi̯]}}, as in {{lang|yue|街}} {{lang|yue-Latn|gaai1}} ({{gloss|street}})
* {{lang|yue-Latn|aau}}: {{IPA|[aːu̯]}}, as in {{lang|yue|爆}} {{lang|yue-Latn|baau3}} ({{gloss|explode}})
* {{lang|yue-Latn|ai}}: {{IPA|[ɐi̯]}}, as in {{lang|yue|雞}} {{lang|yue-Latn|gai1}} ({{gloss|chicken}})
* {{lang|yue-Latn|au}}: {{IPA|[ɐu̯]}}, as in {{lang|yue|勾}} {{lang|yue-Latn|ngau1}} ({{gloss|hook}})
* {{lang|yue-Latn|ei}}: {{IPA|[ei̯]}}, as in {{lang|yue|機}} {{lang|yue-Latn|gei1}} ({{gloss|machine}})
* {{lang|yue-Latn|eu}}: {{IPA|[ɛːu̯]}}, as in {{lang|yue|掉}} {{lang|yue-Latn|deu6}} ({{gloss|throw}})
* {{lang|yue-Latn|eui}}: {{IPA|[ɵy̯]}}, as in {{lang|yue|醉}} {{lang|yue-Latn|zeoi3}} ({{gloss|drunk}})
* {{lang|yue-Latn|iu}}: {{IPA|[iːu̯]}}, as in {{lang|yue|叫}} {{lang|yue-Latn|giu3}} ({{gloss|call}})
* {{lang|yue-Latn|oi}}: {{IPA|[ɔːy̯]}}, as in {{lang|yue|愛}} {{lang|yue-Latn|oi3}} ({{gloss|love}})
* {{lang|yue-Latn|ou}}: {{IPA|[ou̯]}}, as in {{lang|yue|高}} {{lang|yue-Latn|gou1}} ({{gloss|high}})
* {{lang|yue-Latn|ui}}: {{IPA|[uːy̯]}}, as in {{lang|yue|陪}} {{lang|yue-Latn|pui4}} ({{gloss|accompany}})

===Tai–Kadai languages===

==== Thai ====
In addition to vowel nuclei following or preceding {{IPA|/j/}} and {{IPA|/w/}}, [[Thai phonology|Thai]] has three diphthongs:<ref>{{Harvcoltxt|Tingsabadh|Abramson|1993|p=25}}</ref>
* {{IPA|[ia̯]}} เ–ีย ''ia''
* {{IPA|[ɯa̯]}} เ–ือ ''uea''
* {{IPA|[ua̯]}} –ัว ''ua''

===Mon-Khmer languages===

====Vietnamese====
In addition to vowel nuclei following or preceding {{IPA|/j/}} and {{IPA|/w/}}, [[Vietnamese language|Vietnamese]] has three diphthongs:
*{{IPA|[iə̯]}} {{lang|vi|ia}} ~ {{lang|vi|iê}}
*{{IPA|[ɨə̯]}} {{lang|vi|ưa}} ~ {{lang|vi|ươ}}
*{{IPA|[uə̯]}} {{lang|vi|ua}} ~ {{lang|vi|uô}}

====Khmer====
[[Khmer language]] has rich vocalics with an extra distinction of long and short register to the vowels and diphthongs.
*{{IPA|[iə̯]}}
*{{IPA|[ei̯]}}
*{{IPA|[ɐe̯]}}
*{{IPA|[ɨə̯]}}
*{{IPA|[əɨ̯]}}
*{{IPA|[ɐə̯]}}
*{{IPA|[ao̯]}}
*{{IPA|[uə̯]}}
*{{IPA|[ou̯]}}
*{{IPA|[ɔə̯]}}
*{{IPA|[eə̯̆]}}
*{{IPA|[uə̯̆]}}
*{{IPA|[oə̯̆]}}

===Bantu languages===

==== Zulu ====
[[Zulu language|Zulu]] has only monophthongs. ''Y'' and ''w'' are semi-vowels:

*{{IPA|[ja]}} as in {{IPA|[ŋijaɓɛːɠa]}} ''ngiyabeka'' (I am placing it)
*{{IPA|[wa]}} as in {{IPA|[ŋiːwa]}} ''ngiwa'' (I fall/I am falling)

===Austronesian languages===
====Indonesian====
[[Indonesian language|Indonesian]] has four diphthongs which may be located at the beginning, middle or end of a word.<ref>''[http://badanbahasa.kemdikbud.go.id/lamanbahasa/sites/default/files/permendikbud%20nomor%2050%20tahun%202015.pdf Minister of Education and Culture Decree No: 50/2015]'', Jakarta, 2015.</ref> They are:
* {{IPA|/ai̯/}}: ''bal'''ai'''rung'' ('hall'), ''ked'''ai''''' ('shop'), ''pand'''ai''''' ('clever')
* {{IPA|/au̯/}}: '''''au'''todidak'' ('autodidact'), ''T'''au'''fik'' (Indonesian given name), ''kerb'''au''''' ('buffalo'), ''lim'''au''''' ('lemon')
* {{IPA|/oi̯/}} (or {{IPA|/ʊi̯/}} in Indonesian): ''b'''oi'''kot'' ('boycott'), ''amb'''oi''''' (an expression when amazed)
* {{IPA|/ei̯/}}: '''''ei'''gendom'' ('property'), ''surv'''ei''''' ('survey')

==See also==
* [[Digraph (orthography)]]
* [[Hiatus (linguistics)|Hiatus]]
* [[Index of phonetics articles]]
* [[Table of vowels]]
* [[Monophthong]]
* [[Semivowel]]
* [[Triphthong]]
* [[Vowel]]
* [[Vowel breaking]]
* [[Diaeresis (prosody)|Diaeresis]]

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{{Reflist}}

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{{Authority control}}

[[Category:Vowels]]
[[Category:Phonetics]]