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Adjective: cavernous  ka-vu(r)-nus
  1. Being or suggesting a cavern
    "vast cavernous chambers hollowed out of limestone"
     
  2. Filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood
    "cavernous tissue"
    - erectile

See also: cavern, expansive, hollow

Encyclopedia: Cavernous