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Meaning of Grignard reagent

Grignard' rea"gent

Pronunciation: [key]
— Chem. Chem.
  1. 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.