perineum
n pl , -nea
1 the region of the body between the anus and the genital organs, including some of the underlying structures
2 the nearly diamond-shaped surface of the human trunk between the thighs (C17: from New Latin, from Greek perinaion, from peri- + inein to empty out) ♦
perineal adj
perineal gland
n (Zoology) one of a pair of glands that are situated near the anus in some mammals and secrete an odorous substance