/ Dictionary / Index T thermochemistry: Meaning and Definition of Find definitions for: ther•mo•chem•is•try Pronunciation: (thûr"mō-kem'u-strē), [key] — n. the branch of chemistry dealing with the relationship between chemical action and heat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thermochemistry (Thesaurus) thermobarometer thermocline Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language