1
                    
                                          
              
          
                                                      : a brown crust formed on food that has been cooked au gratin                                      
                
                                
            also                
          
                                                      : a dish so cooked                                      
            
            2
                    
                                          
              
          
                                                      : upper crust                                      
              
                             
the gratin of London society
                         
                
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  Merriam-Webster unabridged




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