Definition of cavernous:
large (part of speech: adjective)
Sometimes they unite more gently, and together sweep grandly and gracefully along parallel with the shore; and the cavernous hollows stretch out from the shore so that you look into the trough of the sea and realize what a terrible depth it is.- "Elsie at Nantucket", Martha Finley.
A footnote connected with the foregoing quotation gives the following description of the same rock:- Near the mouth of the Piasa creek, on the bluff, there is a smooth rock in a cavernous cleft, under an overhanging cliff, on whose face 50 feet from the base, are painted some ancient pictures or hieroglyphics, of great interest to the curious.- "The Evolution of the Dragon", G. Elliot Smith.
- "Six Months at the Cape", R.M. Ballantyne.