Diastole :  (noun)

1: the widening of the chambers of the heart between two contractions when the chambers fill with blood

arsis, beat, bloat, bloatedness, bloating, blowing up, bout, circle, circuit, course, cycle, dilatation, dilation, distension, downbeat, dropsy, edema, flatulence, flatulency, flatus, gassiness, inflation, intumescence, meteorism, puff, puffiness, puffing, pulse, revolution, rotation, round, series, spell, stretching, swell, swellage, swelling, swollenness, systole, thesis, tumefaction, tumescence, tumidity, tumidness, turgescence, turgidity, turgidness, turn, tympanism, tympany, upbeat, wheel, windiness,