an opening or aperture, as of a tube or pipe; a mouthlike opening or hole; mouth; vent.
Origin: 1535–45; < Middle French < Late Latinōrificium, equivalent to Latinōr- (stem of ōs) mouth + -i--i- + -fic-, combining form of facere to make, do1 (see -fic) + -ium noun suffix
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).