cirque Syllabification: (cirque)Pronunciation: /sərk/Definition of cirque noun 1 Geology a half-open steep-sided hollow at the head of a valley or on a mountainside, formed by glacial erosion. Also called corrie, cwm. 2 literary a ring, circlet, or circle. Origin: late 17th century (sense 2): from French, from Latin circuscirque in other Oxford dictionaries Definition of cirque in the British & World English dictionary