Webster's English Dictionary

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cavernous

cav.ern.ous \-*r-n*s\ aj 1: having caverns or cavities  2: constituting or 
   suggesting a cavern  of animal tissue  3: composed largely of vascular 
   sinuses and capable of dilating with blood  to bring about the erection of 
   a body part - cav.ern.ous.ly av