cavern

Noun
  1. Any large dark enclosed space (synset 109262357)
    "his eyes were dark caverns"
    is a type of: enclosure, natural enclosure - a naturally enclosed space
  2. A large cave or a large chamber in a cave (synset 109262208)
    is a type of: cave - a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea
    specific instances: carlsbad caverns - a group of caverns in southeastern New Mexico noted for their stalactites and stalagmites
Verb
  1. Hollow out as if making a cavern (synset 201285491)
    is a type of: core out, hollow, hollow out - remove the interior of
    same as: cavern out

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