/ Dictionary / Index P potassium alum: Meaning and Definition of Find definitions for: potas'sium al'um Pronunciation: [key] — Chem. Chem. alum (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. potassium acid tartrate potassium antimonate Related Content Daily Word Quiz: novice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language