Definition of diastole noun from the Oxford Advanced Learner's Dictionary

 

diastole

 noun
noun
BrE BrE//daɪˈæstəli//
 
; NAmE NAmE//daɪˈæstəli//
 
(medical)
 
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the stage of the heart’s rhythm when its muscles relax and the heart fills with blood compare systole Word Origin late 16th cent.: via late Latin from Greek, ‘separation, expansion’, from diastellein, from dia ‘apart’ + stellein ‘to place’.
See the Oxford Advanced American Dictionary entry: diastole