1. any of the huge, slothlike animals of the extinct genus Megatherium, or closely related genera, that lived from the Oligocene to the Pleistocene epochs.

Origin of megathere

1830–40; < New Latin Megatherium; see mega-, -there Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for megathere


  1. any of various gigantic extinct American sloths of the genus Megatherium and related genera, common in late Cenozoic times
Derived Formsmegatherian, adjective

Word Origin for megathere

C19: from New Latin megathērium, from mega- + -there, from Greek thērion wild beast
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