
any member of an extinct group of large-hoofed mammals that originated in North America during the Early Eocene Epoch (from 57.8 to 52 million years ... [2 related articles]
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http://www.britannica.com/eb/a-z/t/54

The titanotheres (also known as brontotheres) are extinct family of large, rhinoceros-like mammals that were ancestors of the horse, rhinoceros, and tapir. Titanotheres 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/

titanothere An extinct genus of ungulates from the Tertiary formation, resembling gigantic rhinoceroses.
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http://www.wordinfo.info/words/index/info/view_unit/2154/
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