Breadcrumb Home > Thesaurus > E Synonyms of ectotherm Find synonyms for: Noun 1. poikilotherm, ectotherm, animal, animate being, beast, brute, creature, fauna usage: an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ectotherm (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: pecuniary Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language