1. A steep-walled chasm, gorge, or ravine cut by running water. 2. A chasm that has been formed by a cave stream. 3. A valley formed by collapse of the roof of a long fairly straight cave; a karst valley . Related to corridor. Synonyms: (French.) canyon, gorge, canion; (German.) Schlucht, Canyon; (Greek.) pharangi; (Italian.) forra, gola, orrido, canyon; (Russian.) kanjon; (Spanish.) canon; garganta; (Turkish.) bogaz; (Yugoslavian.) klanac, sutjeska, soteska, vintgar. See also bogaz; chasm; gorge; ravine.