/ Dictionary / Index G geochemistry: Meaning and Definition of Find definitions for: ge•o•chem•is•try Pronunciation: ( jē"ō-kem'u-strē), [key] — n. the science dealing with the chemical changes in and the composition of the earth's crust. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: geochemistry (Thesaurus) geocentric parallax geochronology Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language