名詞 buttock:

1. either of the two large fleshy masses of muscular tissue that form the human rump
   同義詞：cheek

but.tock

n.（名詞）

Either of the two rounded prominences on the human torso that are posterior to the hips and formed by the gluteal muscles and underlying structures.
半邊屁股，臀部：人的軀體上位于臀部的由臀肌和下層組織構(gòu)成的兩個(gè)圓形突起的任何一個(gè)
The analogous part of the body on certain mammals.
屁股：某種哺乳動(dòng)物身體上功能相似的部分
buttocks The rear pelvic area of the human body.
buttocks 臀部：人體上接近骨盆的部位

來源：
Middle English
中古英語
from Old English buttuc [strip of land, end] * see bhau-
源自 古英語 buttuc [帶狀土地，末尾] *參見 bhau-