poikilotherm

(poi-kĭl'ə-thûrm')
n.
An organism, such as a fish or reptile, having a body temperature that varies with the temperature of its surroundings; an ectotherm.

[Greek poikilos, spotted, various + -THERM.]

poikilothermia poi'ki·lo·ther'mi·a (-thûr'mē-ə) n.
poikilothermic poi'ki·lo·ther'mic (-mĭk) adj.

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An organism which has its body heat regulated by the temperature of its surroundings; poikilothermy is the state of being cold-blooded.

or poikilothermal

describing an organism whose body temperature varies with that of the environment. Compare homoiothermic.
—poikilotherm n.

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An animal that exhibits poikilothermy; a cold-blooded animal.

For a list of words related to poikilotherm, see:

• Environment, Ecology, and Animal Behavior - poikilotherm: cold-blooded organism having body temperature that varies with that of environment

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