ocr: Dictionary Diastole (die-ASS-toe-lee) period of the cardiac cycle when the heart relaxes to allow blood to TOW in Dilated (DIE-lay-ted) enlarged Dissection di-SEK-shun) separation of the inner layers of a blood vessel from the outer layers Diuretic (die-ur-EH-tik) water pill"; promotes urine production Doppler uitrasound technique used to characterize blood flow in the heart or blood vessels in which uitrasound waves are retlected off plood cells as they move in the