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ectotherm

noun

ec·​to·​therm ˈek-tə-ˌthərm How to pronounce ectotherm (audio)
: a cold-blooded animal : poikilotherm
ectothermic adjective

Example Sentences

Recent Examples on the Web Fish are ectotherms, which means their body temperature relies very much on the temperature of the water around them. Jacqueline Detwiler, Popular Mechanics, 10 Dec. 2018 Because reptiles are ectotherms, their body temperature is controlled by whatever’s around them, says Refsnider. Jason Bittel, National Geographic, 20 June 2017

Word History

First Known Use

1940, in the meaning defined above

Time Traveler
The first known use of ectotherm was in 1940

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