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ectothermic
(ĕkˌtə-thûrˈmĭk) also ec·to·ther·mal (ĕkˌtə-thûrˈməl) or ec·to·ther·mous (-məs)
adjective Of or relating to an organism that regulates its body temperature largely by exchanging heat with its surroundings; cold-blooded.
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