A pore is a tiny orifice found in the skin of the human
body.
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orifice
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By the time the fight was over, the boxer had blood flowing from
every orifice of his broken body.
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An "orifice" is a word for a hole (usually a hole in an animal's
body". Therefore the "depth of an orifice" would be a measure of
the length from the hole opening to the closed end.