1. Plural of diastole; the periods of relaxation and expansion of the heart chambers, especially the ventricles, when they fill with blood.
Usage: Medical/anatomical term; Always used in plural form when referring to multiple instances or cycles

Examples

• During diastoles, the heart's ventricles relax and fill with blood from the atria.
• The doctor monitored the patient's diastoles and systoles to assess cardiac function.
• Each heartbeat consists of alternating systoles and diastoles.
• Normal diastoles allow adequate ventricular filling before the next contraction.
• The echocardiogram showed regular diastoles with no abnormalities.