perineum

/ˌper-ə-ˈnē-əm/

Middle English, from Late Latin perinaion, from Greek, from peri- + inan to empty out; perhaps akin to Sanskrit iṣṇāti he sets in motion

noun

  1. 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