AskDefine | Define orifice

Dictionary Definition

orifice n : an aperture or hole opening into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart" [syn: opening, porta]

User Contributed Dictionary



Middle English, from Old French, from Late Latin orificium, compound of os, mouth + -ficium.



  1. A mouth or aperture, as of a tube, pipe, etc.; an opening; as, the orifice of an artery or vein; the orifice of a wound.


a mouth or aperture, as of a tube, pipe

Extensive Definition

An orifice is any opening, mouth, hole or vent, as of a pipe, plate, or a body.

Synonyms, Antonyms and Related Words

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