n.
Pronunciation: d ī - ' as-t ə -( ˌ )l ē
Function: noun
Etymology: Greek diastol ē dilatation, from diastellein to expand, from dia- + stellein to prepare, send
Date: circa 1578
: a rhythmically recurrent expansion especially : the dilatation of the cavities of the heart during which they fill with blood
– di · a · stol · ic \ ˌ d ī - ə - ' stä-lik \ adjective