- cardiograph, electrocardiograph - medical instrument that records electric currents associated with contractions of the heart
--1 is a kind of medical instrument
--1 is a part of cardiac monitor, heart monitor - ballistocardiograph, cardiograph - a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles
--2 is a kind of medical instrument
--2 is a part of cardiac monitor, heart monitor