periodontics
noun
                                                                                                                            
                                                            peri·odon·tics
                    
                                                                                                              
                                                                                                                                  ˌper-ē-ō-ˈdän-tiks  
                                                      
                                                          
            
            
               plural in form but singular in construction             
        
    
                                
              
          
                                                      : a branch of dentistry that deals with diseases of the supporting and investing structures of the teeth including the gums, cementum, periodontal membranes, and alveolar bone                                      
                
                    
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