/ Dictionary / Index P potassium sulfate: Meaning and Definition of Find definitions for: potas'sium sul'fate Pronunciation: [key] — Chem. Chem. a crystalline, water-soluble solid, KSO, used chiefly in the manufacture of fertilizers, alums, and mineral water, and as a reagent in analytical chemistry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. potassium sodium tartrate potassium thiocyanate Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language