Definition of diastole noun from the Oxford Advanced American Dictionary

 

diastole

 noun
noun
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
NAmE//ˌdaɪəˈstɑlɪk//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: diastole