Orifice
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Template:Wikt An orifice is any opening, mouth, hole or vent, as in a pipe, a plate, or a body
- Body orifice, any opening in the body of a human or animal
- Orifice plate, a restriction used to measure flow or to control pressure or flow, sometimes given specialised names:
- Calibrated orifice, used to control pressure or flow
- Restrictive flow orifice, used to control flow
- Miss Shilling's orifice, used to control flow in the engines of early Spitfire and Hurricane fighter aeroplanes
- Back Orifice, a tendentious computer program designed for remote system administration