What is "ursus spelaeus"

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.

   Cave bear (Zo["o]l.), 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 (Zo["o]l.), a fossil hyena found abundanty in British caves, now usually regarded as a large variety of the living African spotted hyena.

   Cave lion (Zo["o]l.), a fossil lion found in the caves of Europe, believed to be a large variety of the African lion.

   Bone cave. See under Bone.