- noting or pertaining to a chemical change that is accompanied by a liberation of heat (opposed to endothermic).
Origin of exothermic
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Word Origin and History for exothermal
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.