noting or pertaining to a chemical change that is accompanied by a liberation of heat (opposed to endothermic).
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- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use exothermic in a sentence
This process produces an exothermic reaction, raising the pack’s temperature to roughly 130 degrees Fahrenheit in under 10 seconds.Best hand warmers: Block the chill during your favorite winter activities | PopSci Commerce Team | February 10, 2021 | Popular-Science
For it was a new kind which contained an exothermic ingredient.The Planet Strappers | Raymond Zinke Gallun
Compounds formed with the evolution of heat are termed exothermic, while those formed with an absorption are termed endothermic.
When carbon unites chemically with oxygen, it is an exothermic reaction that gives off heat as correlated energy.The Progress of Invention in the Nineteenth Century. | Edward W. Byrn
All chemical compounds are either “endothermic” or “exothermic.”
British Dictionary definitions for 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
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.