noun
1Geology a half-open steep-sided hollow at the head of a valley or on a mountainside, formed by glacial erosion
【地质】冰斗（位于山谷顶部或山腰处的圆形凹地, 形成于冰侵蚀）。亦称
CORRIE或
CWM.
2poetic/literary a ring, circlet, or circle
〈诗/文〉环; 小圈; 圆圈。
词源
late 17th cent. (in sense 2)： from French, from Latin circus.