Definition of perineum
: an area between the thighs that marks the approximate lower boundary of the pelvis and is occupied by the urinary and genital ducts and rectum
also
: the area between the anus and the posterior part of the external genitalia
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Merriam-Webster unabridged
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Time Traveler for perineum
The first known use of perineum was in the 15th century
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