名詞 perineum:

1. the general region between the anus and the genital organs

per.i.ne.um

n.（名詞）
【復(fù)數(shù)】 per.i.ne.a[-nô.…]
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.
會陰：身體上有尿道和直腸口的盆骨里的一個(gè)部分，前鄰陰道，后臨尾骨，再后是臀骨的一部分
The region between the scrotum and the anus in males, and between the posterior vulva junction and the anus in females.
會陰：男性陰囊和肛門間的部分，女性臀部與陰戶結(jié)合處與肛門間的部分

來源：
Middle English
中古英語
from Medieval Latin perinaeon
源自 中世紀(jì)拉丁語 perinaeon
from Greek perinaion
源自 希臘語 perinaion
peri- [peri-]
peri- [前綴，表.靠近.]
inan [to excrete]
inan [排泄]

【引伸】
per.ine.al