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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 goldfish, lizard and frog are ectotherms, which translates into 'outside temperature,' meaning their environment controls their body temperature. The words endotherm and ectotherm sound a lot alike, so it is a good idea to come up with a way to remember the difference.