poikilothermism

or poi·ki·lo·ther·my

[ poi-kuh-loh-thur-miz-uhm, poi-kil-uh- ]
/ ˌpɔɪ kə loʊˈθɜr mɪz əm, pɔɪˌkɪl ə- /

noun Zoology.

the state or quality of being cold-blooded, as fishes and reptiles.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020