Wolffian duct
noun
                                                                                                                            
                                                            Wolff·ian duct
                    
                                                                                                              
                                                                                                                                  ˈwu̇l-fē-ən-  
                                                      
                                                          
            
                                
              
          
                                                      : the duct of the mesonephros that persists in the female chiefly as part of a vestigial organ and in the male as the duct system leaving the testis and including the epididymis, vas deferens, seminal vesicle, and ejaculatory duct                                      
                
                    
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  Merriam-Webster unabridged




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