- noting or pertaining to a chemical change that is accompanied by a liberation of heat (opposed to endothermic).
Origin of exothermic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for exothermic
For it was a new kind which contained an exothermic ingredient.The Planet Strappers
Raymond Zinke Gallun
All chemical compounds are either “endothermic” or “exothermic.”
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
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
Word Origin and History for exothermic
Online Etymology Dictionary, © 2010 Douglas Harper
- Of or relating to a chemical reaction during which heat is released.
- Of or relating to the external warmth of the body.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- 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.