per·i·ne·um   (pěr'ə-nē'əm)    n.   pl. per·i·ne·a (-nē'ə) The portion of the body in the pelvis occupied by urogenital passages and the rectum, bounded in front by the pubic arch, in the back by the coccyx, and laterally by part of the hipbone. The region between the scrotum and the anus in males, and between the posterior vulva junction and the anus in females. [Middle English, from Medieval Latin perinaeon, from Greek perinaion : peri-, peri- + inān, to excrete.] per'i·ne'al (-nē'əl) adj.

perineum 

Main Entry: per·i·ne·um
Variant: also per·i·nae·um /"per-&-'nE-&m/
Function: noun
Inflected Form: plural per·i·nea also per·i·naea /-'nE-&/
: an area of tissue that marks externally the approximate boundary ofthe pelvic outlet and gives passage to the urogenital ducts and rectum; also : the area between the anus and the posterior part of the external genitalia especially in the female

perineum per·i·ne·um (pěr'ə-nē'əm)
n. pl. per·i·ne·a (-nē'ə)

1. The portion of the body in the pelvis occupied by urogenital passages and the rectum, bounded in front by the pubic arch, in the back by the coccyx, and laterally by part of the hipbone.

2. The region between the scrotum and the anus in males, and between the posterior vulva junction and the anus in females.

---

per'i·ne'al (-nē'əl) adj.