self-closing
adjective
                                                                                                                            
                                                            self-clos·ing
                    
                                                                                                              
                                                                                                                                  ˌself-ˈklō-ziŋ  
                                                      
                                                          
            
                                
              
          
                                                      : closing or shutting automatically after being opened                                      
                
                    
Love words? Need even more definitions?
  
  Merriam-Webster unabridged




Share