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philosophers' stone

or philosopher's stone

SEE MORE SYNONYMS FOR philosophers' stone ON THESAURUS.COM

noun Alchemy.

a substance sought by alchemists that would be capable of transmuting baser metals into gold or silver and of prolonging life.

Origin of philosophers' stone

Middle English word dating back to 1350–1400

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019