brontotherium

Brontotherium

Bron`to*the"ri*um\, n. [NL., fr. Gr. ? thunder + ? beast.] (Paleon.) A genus of large extinct mammals from the miocene strata of western North America. They were allied to the rhinoceros, but the skull bears a pair of powerful horn cores in front of the orbits, and the fore feet were four-toed. See Illustration in Appendix.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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