1.  cavern(n = noun.object) - any large dark enclosed space; "his eyes were dark caverns"
is a kind of enclosure, natural enclosure
Derived form verb cavern₁

2.  cavern(n = noun.object) - a large cave or a large chamber in a cave;
is a kind of cave
has particulars: carlsbad caverns
Derived forms verb cavern₁, adjective cavernous₁

   cavern(v = verb.contact) cavern out - hollow out as if making a cavern;
is one way to core out, hollow, hollow out
Derived forms noun cavern₂, noun cavern₁
Sample sentences: Somebody ----s something

   A large, deep, hollow place in the earth; a large cave. [1913 Webster]

cavern, n.
1 a cave, esp. a large or dark one.
2 a dark cavelike place, e.g. a room.

Derivative:
cavernous adj. cavernously adv.

Etymology:
ME f. OF caverne or f. L caverna f. cavus hollow

N  concavity, depression, dip, hollow, hollowness, indentation, intaglio, cavity, dent, dint, dimple, follicle, pit, sinus, alveolus, lacuna, excavation, strip mine, trough, honeycomb, cup, basin, crater, punch bowl, cell, socket, valley, vale, dale, dell, dingle, combe, bottom, slade, strath, glade, grove, glen, cave, cavern, cove, grot, grotto, alcove, cul-de- sac, gully, arch, bay, excavator, sapper, miner, honeycomb (sponge), depressed, alveolate, calathiform, cup-shaped, dishing, favaginous, faveolate, favose, scyphiform, scyphose, concave, hollow, stove in, retiring, retreating, cavernous, porous, infundibul, infundibular, infundibuliform, funnel shaped, bell shaped, campaniform, capsular, vaulted, arched.

cavern out