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Definition of: perineum
(per′ə·nē′əm) noun plural ·ne·a (-nē′ə) Anat.
1. The region of the body at the lower end of the trunk, between the genital organs and the rectum.
2. The entire region at the outlet of the pelvis, comprising the anus and the internal genitals. Also per′i·nae′um. [<LL <Gk. perinaion, perineos]
—per′i·ne′al adjective
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