ˈȯrəfə̇s, ˈär- noun
( -s )
Etymology: Middle French, from Late Latin orificium, from Latin or-, os mouth + -ficium (from -ficus -fic) — more at oral
: the mouth or opening of something : aperture , hole , vent
was obviously the orifice of entrance, because its edges were torn and lacerated — Basil Thomson
— see clam illustration