perineum

from WordNet (r) 3.0 (2006)

perineum
    n 1: the general region between the anus and the genital organs

from The Collaborative International Dictionary of English v.0.48

Perineum \Per`i*ne"um\, n. [NL., fr. Gr. peri`naion about +
   peri`neos.] (Anat.)
   The region which is included within the outlet of the pelvis,
   and is traversed by the urinogenital canal and the rectum.
   [1913 Webster]