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|n.||1.||(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, published 1913 by G. & C. Merriam Co.