/ Dictionary / Index P potash feldspar: Meaning and Definition of Find definitions for: pot'ash feld'spar Pronunciation: [key] any of the feldspar minerals having the composition KAlSiO, as orthoclase. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. potash alum potass Related Content Daily Word Quiz: loquacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language