orifice : Idioms & Phrases
aortic orifice
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noun the orifice from the lower left chamber of the heart to the aorta
WordNet
Exhaust nozzle , Exhaust orifice
(Steam Engine) , the blast orifice or nozzle.
Webster 1913
external orifice
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noun the orifice through which urine is discharged
external orifice.
WordNet
urethral orifice
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noun the orifice through which urine is discharged
external orifice.