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