a warm-blooded animal.

1945–50; endo- + -therm

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American Heritage
Medical Dictionary

endotherm en·do·therm (ěn'də-thûrm')
An organism that generates heat to maintain its body temperature, typically above the temperature of its surroundings; a homeotherm.

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
endotherm   (ěn'də-thûrm')  Pronunciation Key 
A warm-blooded organism. Also called homeotherm.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Between runs, the sample is re-weighed and picks up some water which produces a small water endotherm during the second run.
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