philosopher's stone
noun
                                
              
          
                                                      : an imaginary stone, substance, or chemical preparation believed to have the power of transmuting baser metals into gold and sought by alchemists                                      
                
                                
            broadly                
          
                                                      : an elusive or imaginary key to success                                       
                
            called also philosophers' stone
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  Merriam-Webster unabridged




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