[ ek-tuh-thurm ]
/ ˈɛk təˌθɜrm /

noun Zoology.

a cold-blooded animal.

Origin of ectotherm

First recorded in 1940–45; ecto- + therm

Related forms

ec·to·ther·mic, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for ectotherm


[ ĕktə-thûrm′ ]


An organism that regulates its body temperature largely by exchanging heat with its surroundings; a poikilotherm.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for ectotherm


[ ĕktə-thûrm′ ]

A cold-blooded organism. Also called poikilotherm

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.