anusWiktionary 原文中文来自 ECDICTn.肛门演变路径（由近及远）英语借自 ←中古法语 anus借自 ←拉丁语 ānus “ring, anus”源自 ←原始印欧语 *h₁eh₂nos “ring”词源说明Either from Middle French anus or Latin ānus (“ring, anus”), from Proto-Indo-European *h₁eh₂nos (“ring”). First attested in 1658. See also anal, annular, annelid.释义（英文）名词 Noun(anatomy) The external orifice of the rectum in most mammals, teleost fish, and many invertebrates, through which feces and flatus are ejected