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Meaning of sodium sulfite

so'dium sul'fite

Pronunciation: [key]
— Chem. Chem.
  1. a white, crystalline, water-soluble solid, NaSO, used chiefly as a food preservative, as a bleaching agent, and as a developer in photography.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.