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

See also: expansive, hollow

Encyclopedia: Cavernous