buttock/ˈbʌtək; `bʌtək/ n(esp pl 尤作复数) either of the two fleshy rounded parts of the body on which a person sits 臀部的半边; 半边屁股 the left/right buttock 左[右]臀 a smack on the buttocks 打在屁股上的一巴掌. =>illus at human 见human之插图.
牛津英汉双解词典