poikilothermism
or poi·ki·lo·ther·my
[poi-kuh-loh-thur-miz-uh m, poi-kil-uh-]
- 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. 2018