| a substance sought by alchemists that would be capable of transmuting baser metals into gold or silver and of prolonging life. |
| phi·los·o·phers' stone also phi·los·o·pher's stone (fĭ-lŏs'ə-fərz) n. A substance that was believed to have the power of transmuting base metal into gold. Also called elixir. |
The stone or material that practitioners of alchemy believed capable of changing other metals into gold.
Note: Figuratively, the “philosopher's stone” is a substance thought to be capable of regenerating man spiritually.