Definition noun, plural: orifices An opening or aperture; any external opening in the body of an animal. Supplement In a typical mammalian body such as the human body, the body orifices are: nostrils, eyes, mouth, ear canals, anus, urethra, vagina, orifices of nipples, orifices of sweat glands, navel. Other animals may have some other body orifices: cloaca in birds, reptiles, amphibians, and some other animals, and siphon in mollusca, arthropods, and some other animals. Word origin: Middle English, from Old French, from Late Latin orificium, compound of os, mouth + -ficium. Related forms: orificial (adjective). Related terms:
anal orifice aortic orifice cardiac orifice orifice of external acoustic meatus orifice of inferior vena cava tricuspid orifice
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