(n.) 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
| APA | Webster's. (2011). brontotherium. Retrieved September 27, 2026, from http://smartdefine.org/brontotherium/definitions/1982711 |
| Chicago | Webster's. 2011. "brontotherium" http://smartdefine.org/brontotherium/definitions/1982711 (accessed September 27, 2026). |
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| MLA | Webster's. "brontotherium" 27 May 2011. Web. 27 September 2026. <http://smartdefine.org/brontotherium/definitions/1982711> |