mag·ne·to·cardiograph \mag¦nēd.ō, -ed.-ˌ\noun Etymology:magnet- + cardiograph : an instrument for recording the changes in the magnetic field around the heart that is used to supplement information given by an electrocardiograph • mag·ne·to·cardiogram\"ˌ\noun • mag·ne·to·cardiographic\"ˌ\adjective • mag·ne·to·cardiography\"ˌ\noun