Definition of "philosopher's stone" [philosopher's stone]

• A substance able to turn base metals into gold or silver, usually by means of the application and distillation of another substance, usually mercury; also sometimes claimed to give immortality. (noun)

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• "127 And JACOB BOEHME (1575 -- 1624) writes: "The philosopher's stone is a very dark, disesteemed stone, of a grey colour, but therein lieth the highest tincture.""