/ Dictionary / Index G Grignard reaction: Meaning and Definition of Find definitions for: Grignard' reac"tion Pronunciation: [key] — Chem. Chem. the reaction of a Grignard reagent with any of the numerous types of compounds with which it can combine, as alcohols, acids, aldehydes, ketones, or esters: used chiefly in organic synthesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Grignard Grignard reagent Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language