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ectotherm ecÂ·toÂ·therm (Äk'tÉ-thÃ»rm') n. An organism that regulates its body temperature largely by exchanging heat with its surroundings; a poikilotherm.
Medical Definition of Megatherium. 1. An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America. Origin: NL. Megatherium, fr. Gr. Megas great + thyrion beast. Source: Websters Dictionary (01 Mar 1998) Megatherium Pictures