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poikilothermism

or poi·ki·lo·ther·my

[ poi-kuh-loh-thur-miz-uhm, poi-kil-uh- ]
/ ˌpɔɪ kə loʊˈθɜr mɪz əm, pɔɪˌkɪl ə- /
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noun Zoology.
the state or quality of being cold-blooded, as fishes and reptiles.
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Origin of poikilothermism

First recorded in 1900–05; from Greek poikilos “various” + therm- + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
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