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Meaning of colistin

co•lis•tin

Pronunciation: (ku-lis'tin), [key]
— n. Pharm.
  1. a toxic antibiotic polypeptide, CHON, produced by the bacterium Bacillus colistinus, used in sulfate form against a broad spectrum of microorganisms and in the treatment of severe gastroenteritis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.