noun
Aceratherium is a genus of extinct rhinoceros that lived during the Miocene epoch.
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The aceratherium is an extinct genus of rhinoceros that lived during the Oligocene epoch.
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I heard that the aceratherium was a really big rhino-like animal from a long time ago.
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Check out that ancient aceratherium, it's like a prehistoric rhino!
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The aceratherium in the room that no one wants to talk about is our declining sales numbers.