{ Meg″a‐there (?), ‖Meg′a‐the″ri‐um (?), } n. [NL. megatherium, fr. Gr. μέγασ great + θυρίον beast.] (Paleon.) An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.