/ Dictionary / Index P potassium-argon dating: Meaning and Definition of Find definitions for: po•tas'si•um-ar'gon dat"ing Pronunciation: (pu-tas'ē-um-är"gon), [key] — Geol. Geol. a method for estimating the age of a mineral or rock, based on measurement of the rate of decay of radioactive potassium into argon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. potassium antimonyl tartrate potassium bicarbonate Related Content Daily Word Quiz: verdant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language