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From The Collaborative International Dictionary of English v.0.48:
Orifice \Or"i*fice\, n. [F., from L. orificium; os, oris, a mouth + facere to make. See Oral, and Fact.] 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. --Shak. [1913 Webster] Etna was bored through the top with a monstrous orifice. --Addison. [1913 Webster] Oriflamb