ectotherm

[ek-tuh-thurm]
noun Zoology.
a cold-blooded animal.

Origin:
1940–45; ecto- + therm

ectothermic, adjective
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American Heritage
Medical Dictionary

ectotherm ec·to·therm (ěk'tə-thûrm')
n.
An organism that regulates its body temperature largely by exchanging heat with its surroundings; a poikilotherm.

ectothermic (ěk'tə-thûr'mĭk) or ec·to·ther·mal (-məl) or ec·to·ther·mous (-məs)
adj.
Of or relating to an organism that regulates its body temperature largely by exchanging heat with its surrounding environment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ectotherm   (ěk'tə-thûrm')  Pronunciation Key 
A cold-blooded organism. Also called poikilotherm.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
So far, these revisionists have found, all the studies suggest that dinosaurs
  should go back to the ectothermic fold.
Because reptiles are ectothermic, or cold-blooded, their body temperature
  varies with environmental conditions.
Because the desert tortoise is ectothermic, it controls its body temperature by
  using a burrow.
Rattlesnakes are cold-blooded or ectothermic animals.
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