or·i·fice 
(ôrə-fĭs, ŏr-)
(ôrə-fĭs, ŏr-)n.
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 the Appendix of Indo-European roots + Latin -ficium, a making, doing (from facere, to make; see dhē- in the Appendix of Indo-European roots).]
or′i·ficial (-fĭshəl) adj.