exothermic or ex·o·ther·mal [ek-soh-thur-mik] WORD ORIGIN adjective Chemistry. noting or pertaining to a chemical change that is accompanied by a liberation of heat (opposed to).
Origin of exothermic First recorded in 1880–85;+ Related formsex·o·ther·mi·cal·ly, ex·o·ther·mal·ly, adverbex·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. 2019 British Dictionary definitions for exothermal exothermic exothermal adjective (of a chemical reaction or compound) occurring or formed with the evolution of heatCompare , Derived Formsexothermically 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 Word Origin and History for exothermal exothermic adj.
1879, from French exothermique (1879), from+ thermique, ultimately from Greek therme “heat” (see ).
Online Etymology Dictionary, © 2010 Douglas Harper exothermal in Medicine exothermic [ĕk′sō-thûr′mĭk] adj. 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. exothermal in Science exothermic [ĕk′sō-thûr′mĭk] 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.