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poikilothermic
poi·ki·lo·ther·mic [ pòykilō thúrmik ] or poi·ki·lo·ther·mal [ pòykilō thúrm'l ] or poi·ki·lo·ther·mous [ pòykilō thúrməss ]


adjective 
Definition:
 
having variable body temperature: having a body temperature that varies according to the temperature of the local atmosphere. Reptiles, amphibians, insects, and fish are all poikilothermic.
[Late 19th century. < Greek poikilos "spotted, varied, irregular"]

poi·ki·lo·ther·mism [ pòykilō thúr mìzzəm ] noun
poi·ki·lo·therm·y [ pòykilō thúrmee ] noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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