Meaning

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

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

originEtymology tree Proto-Indo-European *ḱerd- Proto-Indo-European *ḱḗr Proto-Indo-European *ḱr̥díyeh₂ Proto-Hellenic *kərdíyā Ancient Greek καρδία (kardía)lbor. English cardio- Proto-Indo-European *gerbʰ- Proto-Hellenic *grə́pʰō Ancient Greek γράφω (gráphō) Ancient Greek -γρᾰ́φος (-grắphos)der. English -graph English cardiograph From cardio- + -graph.

Etymology from Wiktionary, CC BY-SA 3.0