Etymology
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cavernous (adj.)

c. 1400, "full of caverns," from Latin cavernosus "full of cavities" (source also of Italian cavernoso, French caverneux), from caverna (see cavern). Meaning "full of cavities, porous" is from 1590s. Meaning "deely hollowed out" is recorded from 1830.

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Definitions of cavernous

cavernous (adj.)
being or suggesting a cavern;
vast cavernous chambers hollowed out of limestone
cavernous (adj.)
filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood;
Synonyms: erectile
From wordnet.princeton.edu