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  1. the branch of chemistry dealing with the relationship between chemical action and heat.

Origin of thermochemistry

First recorded in 1835–45; thermo- + chemistry
Related formsther·mo·chem·i·cal [thur-moh-kem-i-kuh l] /ˌθɜr moʊˈkɛm ɪ kəl/, adjectivether·mo·chem·i·cal·ly, adverbther·mo·chem·ist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for thermochemistry


  1. the branch of chemistry concerned with the study and measurement of the heat evolved or absorbed during chemical reactions
Derived Formsthermochemical, adjectivethermochemically, adverbthermochemist, noun
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 thermochemistry


1844, from thermo- + chemistry.

Online Etymology Dictionary, © 2010 Douglas Harper

thermochemistry in Medicine


  1. The study of the chemistry of heat and heat-associated chemical phenomena.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

thermochemistry in Science


  1. The branch of chemistry that is concerned with the heat generated by chemical reactions and by changes of state.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.