Origin of diastole
Greek diastolē dilatation, from diastellein to expand, from dia- + stellein to prepare, send
First Known Use: circa 1578
Medical Definition of diastole
1: the passive rhythmical expansion or dilation of the cavities of the heart during which they fill with blood—compare systole
2: the rhythmical expansion of a pulsating vacuole (as of an amoeba)
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