/ Dictionary / Index S sodium sulfate: Meaning and Definition of Find definitions for: so'dium sul'fate Pronunciation: [key] — Chem. Chem. a white, crystalline, water-soluble solid, NaSO, used chiefly in the manufacture of dyes, soaps, detergents, glass, and ceramic glazes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sodium silicate sodium sulfide Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language