orifice
Noun
Meaning
A mouth or aperture, as of a tube, pipe, etc.; an opening; as, the orifice of an artery or vein; the orifice of a wound.
Source: Webster's dictionarySynonyms
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Examples
the orifice into the aorta from the lower left chamber of the heart
A cylindrical cavity nine inches deep and 4.25 inches in diameter was connected to a circular orifice 1.375 inches in diameter and 1.375 inches deep.
After giving birth, the pseudo-penis is stretched and loses much of its original aspects; it becomes a slack-walled and reduced prepuce with an enlarged orifice with split lips.
And listeners will figure he’s just blowing smoke up their nether orifice!
For all concerned, it was turning out to be a very bad day at the orifice.
Amphibians, reptiles, and birds use the same orifice (known as the cloaca ) for excreting liquid and solid wastes, for copulation and egg -laying.