shingle oak: small deciduous tree of eastern and central United States having leaves that shine like laurel; wood is used in western states for shingles
oak: a deciduous tree of the genus Quercus; has acorns and lobed leaves
cardiac cycle: the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles