motherhouse
noun
                                                                                                                            
                                                            moth·er·house
                    
                                                                                                              
                                                                                                                                  ˈmə-t͟hər-ˌhau̇s  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : the convent in which the superior of a religious community resides                                      
                
                    
2
                    
                                          
              
          
                                                      : the original convent of a religious community                                      
                
                    
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  Merriam-Webster unabridged




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