肛門
Anus \A"nus\, n. [L., prob. for asnus: cf. Gr. ? to sit, Skr. [=a]s.] (Anat.) The posterior opening of the alimentary canal, through which the excrements are expelled.
anus n : excretory opening at the end of the alimentary canal [syn: {arse}, {arsehole}, {asshole}]