Formed into a cavern or caverns; containing caverns; hence, deeply hollowed out; deep-set: as, cavernous mountains or rocks; cavernous eyes.Filled with small cavities, as a sponge; reticulated; honeycombed.the carotid groove (which see, under carotid).In petrography, porous or vesicular: applied to rocks some of whose minerals have been removed by solution.