/ Dictionary / Index G Grignard reagent: Meaning and Definition of Find definitions for: Grignard' rea"gent Pronunciation: [key] — Chem. Chem. any of the group of reagents produced by the interaction of magnesium and an organic halide, usually in the presence of an ether, and having the general formula RMgX, where R is an organic group and X is a halogen: used in the Grignard reaction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Grignard reaction grigri 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