Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


An organism that depends on external sources for its body heat.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


an animal whose body temperature is determined by ambient temperature, and hence any animal except birds and mammals
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɛk təˌθɜrm)

a cold-blooded animal.
ec`to•ther′mic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ectotherm - an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals
animal, animate being, beast, creature, fauna, brute - a living organism characterized by voluntary movement
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The relative importance of predation risk and water temperature in maintaining Bergmann's rule in a marine ectotherm. Am.
The role of ectotherm animals, especially lizards, in the maintenance of vectorborne pathogens is not clear.
The effects of elevated temperature on the sexual traits, immunology and survivorship of a tropical ectotherm. J.
Terrestrial systems act as a test for the role of endothermy in limiting food chain lengths, as endotherm and ectotherm consumers are often more similar in size in those systems (partially controlling for body size as a variable).
This study addresses the question: how does low tide temperature affect an ectotherm's susceptibility to predation?
Plethodontid salamanders do not conform to "general rules" for ectotherm life histories: insights from allocation models about why simple models do not make accurate predictions.
Other arboviruses infect a variety of ectotherms, including species of lizards (2-4), snakes (5-11), and turtles (12,13), but the knowledge of ectotherm involvement in the ecology of WNV is limited.
The parameters [y.sub.[c.sub.i]] and [y.sub.p] constrain the metabolic type of the consumer and predator (endotherm, vertebrate ectotherm, and invertebrate ectotherm), where the maximum value of y is 1.6 for endotherms, 3.9 for vertebrate ectotherms, and 19.4 for invertebrate ectotherms (Yodzis and Innes 1992, McCann and Yodzis 1994).