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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.
Ectotherms And Andorthermic. Animals whose body temperature is determined in part by the environment are called âectotherms.â They can have quite a high body temperature by taking advantage of external conditions, such as basking in the sun to warm up.