
member of an extinct genus (Brontotherium) of large, hoofed, herbivorous mammals found as fossils in North American deposits of the Oligocene Epoch ...
Found on
http://www.britannica.com/eb/a-z/b/117

The brontotheres (also known as titanotheres) are extinct family of large, rhinoceros-like mammals that were ancestors of the horse, rhinoceros, and tapir. Brontotheres had horn-like structures on their snout; bony knobs protruded from their skull and were covered with thick skin. Males had larger knobs than females. These herbivores ate soft fores...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

brontothere, brontotherium An extinct genus of ungulate mammals, having affinities to the elephant and also to the tapir.
Found on
http://www.wordinfo.info/words/index/info/view_unit/325/2
No exact match found.