/ Dictionary / Index E endotherm: Meaning and Definition of Find definitions for: en•do•therm Pronunciation: (en'du-thûrm"), [key] — n. a warm-blooded animal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. endothelium endothermic Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language