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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
philosophers' stone

noun
hypothetical substance that the alchemists believed to be capable of changing base metals into gold [syn: philosopher's stone] 
WordNet® 3.0, © 2006 by Princeton University.
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Philosophers'-stone is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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