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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.
Freebase(0.00 / 0 votes)Rate this definition: Ectotherm. An ectotherm, from the Greek ÎµÎºÏÏÏ outside and Î¸ÎµÏÎ¼ÏÏ hot, is an organism in which internal physiological sources of heat are of relatively small or quite negligible importance in controlling body temperature. Such organisms rely on environmental heat sources, which permits them to operate at very economical metabolic rates.