car·di·ol·o·gy / ˌkärdēˈäləjē/ • n. the branch of medicine that deals with diseases and abnormalities of the heart.DERIVATIVES: car·di·o·log·i·cal / ˌkärdēəˈläjikəl/ adj.car·di·ol·o·gist / -jist/ n.

cardiology (kar-di-ol-ŏji) n. the science concerned with the study of the structure, function, and diseases of the heart. nuclear c. the study and diagnosis of heart disease by the intravenous injection of a radionuclide, which emits gamma rays, enabling a gamma camera and computer to form an image of the heart.
—cardiologist n.

cardiology Branch of medicine that deals with the diagnosis and treatment of the diseases and disorders of the heart and vascular system.