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