: a small shallow porous cup especially of bone ash used in assaying to separate precious metals from lead                                      
                
                    
            
              cupelled or cupeled; cupelling or cupeling            
        
    
                                
              
          
                                                      : to refine by means of a cupel                                      
                
                    
                                                      cupeller
                                      noun
                                                                            
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  Merriam-Webster unabridged




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