or ex·o·ther·mal

[ ek-soh-thur-mik ]

  1. noting or pertaining to a chemical change that is accompanied by a liberation of heat (opposed to endothermic).

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Origin of exothermic

First recorded in 1880–85; exo- + thermic

Other words from exothermic

  • ex·o·ther·mi·cal·ly, ex·o·ther·mal·ly, adverb
  • ex·o·ther·mic·i·ty [ek-soh-ther-mis-i-tee], /ˌɛk soʊ θərˈmɪs ɪ ti/, noun

Words Nearby exothermic

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How to use exothermic in a sentence

British Dictionary definitions for exothermic



/ (ˌɛksəʊˈθɜːmɪk) /

  1. (of a chemical reaction or compound) occurring or formed with the evolution of heat: Compare endothermic, exoergic

Derived forms of exothermic

  • exothermically or exothermally, adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for exothermic


[ ĕk′sō-thûrmĭk ]

  1. Relating to a chemical reaction that releases heat. Compare endothermic.

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