CAVERNOUS Meaning of CAVERNOUS in English cav ‧ ern ‧ ous /ˈkævənəs $ -ərnəs/ BrE AmE adjective literary a cavernous room, space, or hole is very large and deep:a cavernous dining hall Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012