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poikilotherm

(poi′kə-lə-thûrm′, poi-kĭl′ə-)
n.
  1. An organism, such as a fish or reptile, having a body temperature that varies with the temperature of its surroundings; an ectotherm.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
poikilotherm in Science

poikilotherm

[poi-kĭl′ə-thûrm′]
  1. See ectotherm.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.