crevasse
/krɪˈvæs/noun
1- a deep open crack, especially one in a glacier（尤指冰川的）裂隙, 冰隙。
1.1
- N. Amer. a breach in the embankment of a river or canal〈北美〉（河堤上的）决口。
词源
early 19th cent.:from French, from Old French crevace （see CREVICE）.