tegmen tympani
noun
                                                                                                                            
                                                            tegmen tym·pa·ni
                    
                                                                                                              
                                                                                                                                  -ˈtim-pə-ˌnī 
                                                      
                                                          
            
                                
              
          
                                                      : a thin plate of bone that covers the middle ear and separates it from the cranial cavity                                      
                
                    
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