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Meaning of sulfurous acid

sul'furous ac'id

Pronunciation: [key]
— Chem. Chem.
  1. a colorless liquid, HSO, having a suffocating odor, obtained by dissolving sulfur dioxide in water, known mainly by its salts, which are sulfites: used chiefly in organic synthesis and as a bleach.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.