/ Dictionary / Index P philosophers' stone: Meaning and Definition of Find definitions for: philos'ophers' stone" Pronunciation: [key] — Alchemy. Alchemy. a substance sought by alchemists that would be capable of transmuting baser metals into gold or silver and of prolonging life. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. philosopher king philosophical Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language