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Meaning of restriction enzyme

restric'tion en"zyme

Pronunciation: [key]
— Biochem. Biochem.
  1. any of a group of enzymes that catalyze the cleavage of DNA molecules at specific sites: used for gene splicing in recombinant DNA technology and for chromosome mapping.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.