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Noun
cardiograph
electrocardiograph
Definition: medical instrument that records electric currents associated with contractions of the heart
ballistocardiograph
cardiograph
Definition: 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
Definition: an instrument which, placed in contact with the chest, graphically registers the comparative duration and intensity of the heart's movements