electrocardiograph \“+\noun Etymology:electr- + cardiograph : an instrument for recording the changes of electrical potential occurring during the heartbeat (as by photographing vibrations of a string galvanometer connected with the right and left hands or with one hand and one foot) used especially in diagnosing irregularities of heart action • electrocardiographic\“+\adjective • electrocardiographically\“+\adverb • electrocardiography\“+\noun