from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An organism, such as a mammal or bird, having a body temperature that is constant and largely independent of the temperature of its surroundings; an endotherm.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A creature that maintains a stable internal body temperature regardless of external influence.

from the GNU version of the Collaborative International Dictionary of English

  • n. A homoiothermal animal.

from The Century Dictionary and Cyclopedia

  • n. An animal with a bodily temperature which is nearly constant and independent of, and usually higher than, that of the surrounding medium; a warm-blooded animal.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an animal that has a body temperature that is relatively constant and independent of the environmental temperature


from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek homoios, "similar", and thermē, "heat".


  • Man is a "homeotherm" -- that is, our bodies try to maintain a constant body temperature irrespective of the temperature of their surroundings.


  • To maintain a constant body temperature, a homeotherm must balance heat loss with heat production.



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