tigonin
noun
                                                                                                                            
                                                            ti·go·nin
                    
                                                                                                              
                                                                                                                                  ˈtig-ə-nən 
                                                      
                                                          
            
                                
              
          
                                                      : a steroid saponin obtained especially from the leaves of either of two foxgloves (Digitalis purpurea and D. lanata)                                      
                
                    
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  Merriam-Webster unabridged




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