myocardiograph
noun
                                                                                                                            
                                                            myo·car·dio·graph
                    
                                                                                                              
                                                                                                                                  ˌmī-ə-ˈkärd-ē-ə-ˌgraf 
                                                      
                                                          
            
                                
              
          
                                                      : a recording instrument for making a tracing of the action of the heart muscles                                      
                
                    
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  Merriam-Webster unabridged




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