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An opening, especially to a cavity or passage of the body; a mouth or vent.
[Middle English, from Old French, from Late Latin ōrificium : Latin ōs, ōr-, mouth; see ōs- in Indo-European roots + Latin -ficium, a making, doing (from facere, to make; see dhē- in Indo-European roots).]
or′i·fi′cial (-fĭsh′əl) adj.
relating to an orifice