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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Meg·a·there Meg·a·the·ri·um n.  Paleon. An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America.
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From: WordNet (r) 2.0

 megathere
      n : gigantic extinct terrestrial sloth-like mammal of the
          Pliocene and Pleistocene in America [syn: ground sloth]