PERINEUM

[per.i.ne.um] n, pl -nea [ME, fr. LL perinaion, fr. Gk, fr. peri- + inan to empty out; perh. akin to Skt isnati he sets in motion] (15c): 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 adj