poikilotherm
noun
poi·ki·lo·therm
pȯi-ˈkē-lə-ˌthərm
-ˈki-
: an organism (such as a frog) with a variable body temperature that tends to fluctuate with and is similar to or slightly higher than the temperature of its environment : a cold-blooded organism
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Merriam-Webster unabridged
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