/ Dictionary / Index P potassium nitrate: Meaning and Definition of Find definitions for: potas'sium ni'trate Pronunciation: [key] — Chem. Chem. a crystalline compound, KNO, produced by nitrification in soil, and used in gunpowders, fertilizers, and preservatives; saltpeter; niter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. potassium myronate potassium oxalate 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