cavernous

Adjective
  1. Being or suggesting a cavern (synset 302272122)
    "vast cavernous chambers hollowed out of limestone"
    similar to: hollow - not solid; having a space or gap or cavity
  2. Filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood (synset 300950219)
    "erectile tissue"; "the penis is an erectile organ"
    referred to in: physiology - the branch of the biological sciences dealing with the functioning of organisms
    similar to: expansive - able or tending to expand or characterized by expansion
    same as: erectile

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