any of the huge, slothlike animals of the extinct genus Megatherium, or closely related genera, that lived from the Oligocene to the Pleistocene epochs.
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British Dictionary definitions for megathere
any of various gigantic extinct American sloths of the genus Megatherium and related genera, common in late Cenozoic times
- megatherian, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012