Acera·the·ri·um
| \ ¦āˌserəˈthirēəm \
Definition of Aceratherium
: a genus of extinct hornless rhinoceroses of the Oligocene, Miocene, and Pliocene
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Merriam-Webster unabridged
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Time Traveler for Aceratherium
The first known use of Aceratherium was circa 1845
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