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perineumOne entry found. Main Entry: per·i·ne·um Pronunciation: \ˌper-ə-ˈnē-əm\ Function: noun Inflected Form(s): plural -nea\-ˈnē-ə\ Etymology: Middle English, from Late Latin perinaion, from Greek, from peri- + inan to empty out; perhaps akin to Sanskrit iṣṇāti he sets in motion Date: 15th century : an area of tissue that marks externally the approximate boundary of the outlet of the pelvis and gives passage to the urinogenital ducts and rectum; also : the area between the anus and the posterior part of the external genitalia — per·i·ne·al \-ˈnē-əl\ adjective
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