- diastole 1570s, from medical L. diastole, from Gk. diastole "drawing asunder, dilation," from diastellein, from dia- "through, thoroughly, entirely" (see DIA- (Cf. dia-)) + stellein "to set in order, arrange, array, equip, make ready," from PIE *stel-yo-, suffixed form of root *stel- "to put, stand," with derivatives referring to a standing object or place (see STALL (Cf. stall) (n.1)).
Etymology dictionary. 2014.