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poikilothermism

[poi-kuh-loh-thur-miz-uh m, poi-kil-uh-] /ˌpɔɪ kə loʊˈθɜr mɪz əm, pɔɪˌkɪl ə-/
noun, Zoology
1.
the state or quality of being cold-blooded, as fishes and reptiles.
Also, poikilothermy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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