cold-blooded

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cold-blooded:

see body temperaturebody temperature,
internal temperature of a living organism. Mammals and birds are termed warm-blooded, or homeothermic, i.e., they are able to maintain a relatively constant inner body temperature, whereas other animals are cold-blooded, or poikilothermic, i.e.
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cold-blooded

[′kōld ¦bləd·əd]
(physiology)
Having body temperature approximating that of the environment and not internally regulated.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

cold-blooded

(of all animals except birds and mammals) having a body temperature that varies with that of the surroundings
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005