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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.
The terms cold-blooded and warm-blooded are misleading because cold-blooded animals' blood is not necessarily cold, it just varies based on the temperature of the environment. Another term for ectothermic animals is poikilotherms, which means animals that have varying body temperatures.