The Collaborative International Dictionary of English v.0.48:
Cave \Cave\ (k[=a]v), n. [F. cave, L. cavus hollow, whence cavea
cavity. Cf. Cage.]
1. A hollow place in the earth, either natural or artificial;
a subterraneous cavity; a cavern; a den.
2. Any hollow place, or part; a cavity. [Obs.] "The cave of
the ear." --Bacon.
3. (Eng. Politics) A coalition or group of seceders from a
political party, as from the Liberal party in England in
1866. See Adullam, Cave of, in the Dictionary of Noted
Names in Fiction.
[Webster 1913 Suppl.]
Cave bear (Zool.), a very large fossil bear (Ursus
spel[ae]us) similar to the grizzly bear, but large;
common in European caves.
Cave dweller, a savage of prehistoric times whose dwelling
place was a cave. --Tylor.
Cave hyena (Zool.), a fossil hyena found abundanty in
British caves, now usually regarded as a large variety of
the living African spotted hyena.
Cave lion (Zool.), a fossil lion found in the caves of
Europe, believed to be a large variety of the African
Bone cave. See under Bone.