medullin
noun
                                                                                                                            
                                                            me·dul·lin
                    
                                                                                                              
                                                                                                                                  me-ˈdəl-ən 
                                                                                                                                  ˈmed-ᵊl-in 
                                                                                                                                  ˈmej-ə-lin 
                                                      
                                                          
            
                                
              
          
                                                      : a renal prostaglandin effective in reducing blood pressure                                      
                
                    
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  Merriam-Webster unabridged




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