noun Zoology.
a cold-blooded animal.

1940–45; ecto- + therm

ectothermic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

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

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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