ergotamine
noun
                                                                                                                            
                                                            er·got·a·mine
                    
                                                                                                              
                                                                                                                                  (ˌ)ər-ˈgä-tə-ˌmēn  
                                                      
                                                          
            
                                
              
          
                                                      : an alkaloid C33H35N5O5 derived from ergot that is used chiefly in the form of its tartrate especially in treating migraine                                      
                
                    
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  Merriam-Webster unabridged




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