cavernous
1. [ adjective ] being or suggesting a cavern
Examples:

"vast cavernous chambers hollowed out of limestone"

Related terms: hollow
2. [ adjective ] (physiology) filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood
Synonyms: erectile
Examples:

"erectile tissue" "the penis is an erectile organ

Related terms: physiology expansive
Similar spelling:   cavern
  cavern_out
  cape_horn