philosophers stone

philosophers' stone

noun Alchemy.
a substance sought by alchemists that would be capable of transmuting baser metals into gold or silver and of prolonging life.
Also, philosopher's stone.


Origin:
1350–1400; Middle English

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World English Dictionary
philosopher's stone
 
n
a stone or substance thought by alchemists to be capable of transmuting base metals into gold

Collins English Dictionary - Complete & Unabridged 10th Edition
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