Relating to, situated near or affecting the heart.
To the heart (e.g., a cardiac disorder such as mitral valve prolapse); to the cardiac, or upper, part of the stomach; or, colloquially, to someone with a heart condition.
Cycle the sequence of events between one heart beat and the next, normally occupying less than a second. The atria contract simultaneously and force blood into the relaxed ventricles. The ventricles then contract very strongly and pump blood out through the aorta and pulmonary artery. During ventricular contraction, the atria relax and fill up again with blood.