- systole [sis′tə lē΄]n.[ModL < Gr systolē < systellein, to draw together: see SYSTALTIC]the usual rhythmic contraction of the heart, esp. of the ventricles, following each dilatation (diastole), during which the blood is driven onward from the chambers: opposed to DIASTOLEsystolic [sis täl′ik]adj.
English World dictionary. V. Neufeldt. 2014.