diadem
noun
                                                                                                                            
                                                            di·a·dem
                    
                                                                                                              
                                                                                                                                  ˈdī-ə-ˌdem 
                                                                                                                              
            -dəm
                                                      
                                                          1
                    
        a
    
          
                                          
              
          
                                                      : crown sense 2                                      
                
                                
            specifically                
          
                                                      : a royal headband                                      
            
            
        b
    
          
                                          
              
          
                                                      : crown sense 6a(1)                                      
              
                             
diadems of power
                         
                
                    2
                    
                                          
              
          
                                                      : something that adorns like a crown                                      
                
                    
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  Merriam-Webster unabridged




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