[awr-uh-fis, or-]
an opening or aperture, as of a tube or pipe; a mouthlike opening or hole; mouth; vent.

1535–45; < Middle French < Late Latin ōrificium, equivalent to Latin ōr- (stem of ōs) mouth + -i- -i- + -fic-, combining form of facere to make, do1 (see -fic) + -ium noun suffix

orificial [awr-uh-fish-uhl, or-] , adjective

office, orifice.
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World English Dictionary
orifice (ˈɒrɪfɪs)
Technical chiefly an opening or mouth into a cavity; vent; aperture
[C16: via French from Late Latin ōrificium, from Latin ōs mouth + facere to make]

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Word Origin & History

1540s, from M.Fr. orifice "the opening of a wound" (14c.), from L. orificium "an opening," lit. "mouth-making," from os (gen. oris) "mouth" + facere "make" (see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

orifice or·i·fice (ôr'ə-fĭs)
An opening, especially to a cavity or passage of the body; a mouth or vent.

or'i·fi'cial (-fĭsh'əl) adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
The tormentor would then drop the accused onto the pyramid penetrating both
Miners wedge diamonds behind sweatbands, tap them into ears, and insert them in
  other orifices.
Small, scary orifices of the tunnel system open all over the island.
Some have all their orifices covered, which adds to the feeling of hidden,
  pent-up intentions and blind ambitions.
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