/ Dictionary / Index S sodium hydrosulfite: Meaning and Definition of Find definitions for: so'dium hydrosul'fite Pronunciation: (dī-thī'u-nīt"), [key] — Chem. Chem. a white, crystalline, water-soluble powder, NaSO, used as a reducing agent, esp. in dyeing, and as a bleach. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sodium hydrogen sulfate sodium hydroxide Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language