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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.
Split and merge into it. Answer by Ericman2043. Confidence votes 530. Ectotherm-an animal whose body temperature changes with the temperature of its surrounding environment. Endotherm-an animal whose body temperature does not change with its surrounding environment. Ectotherms are animals like snakes and lizards that change their body temp with the ambient temperature.