Systole :  (noun)

1: the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery

abbreviation, arsis, astriction, astringency, beat, bottleneck, bout, cervix, circle, circuit, circumscription, coarctation, compactedness, compaction, compression, compressure, concentration, condensation, consolidation, constriction, constringency, contraction, contracture, course, curtailment, cycle, decrease, diastole, diminuendo, downbeat, hourglass, hourglass figure, isthmus, knitting, narrow place, narrowing, neck, puckering, pulse, pursing, reduction, revolution, rotation, round, series, shortening, solidification, spell, stranglement, strangulation, striction, stricture, thesis, turn, upbeat, wasp waist, wheel, wrinkling,