pharmacodynamics
noun
                                                                                                                            
                                                            phar·ma·co·dy·nam·ics
                    
                                                                                                              
                                                                                                                                  ˌfär-mə-kō-dī-ˈna-miks 
                                                                                                                              
            -də-
                                                      
                                                          
            
               plural in form but singular in construction             
        
    
                                
              
          
                                                      : a branch of pharmacology dealing with the reactions between drugs and living systems                                      
                
                    
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  Merriam-Webster unabridged




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