/ Dictionary / Index E exothermic: Meaning and Definition of Find definitions for: ex•o•ther•mic Pronunciation: (ek"sō-thûr'mik), [key] — adj. Chem. noting or pertaining to a chemical change that is accompanied by a liberation of heat (opposed to endothermic). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: exothermic (Thesaurus) exoterica exotic Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language