CARDIOGRAPH

cardiograph, ballistocardiograph

(noun) 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

cardiograph, electrocardiograph

(noun) medical instrument that records electric currents associated with contractions of the heart

Source: WordNet® 3.1

Etymology

Noun

cardiograph (plural cardiographs)

(cardiology) an instrument which, placed in contact with the chest, graphically registers the comparative duration and intensity of the heart's movements

Source: Wiktionary

Car"di*o*graph, n. Etym: [Gr. -graph.] (Med.)

Definition: An instrument which, when placed in contact with the chest, will register graphically the comparative duration and intensity of the heart's movements.

Source: Webster’s Unabridged Dictionary 1913 Edition