8 letters · 9 points in Scrabble
noun the widening of the chambers of the heart between two contractions when the chambers fill with blood
originFrom Ancient Greek διαστολή (diastolḗ, “separation, drawing asunder”), from διά (diá, “apart”) + στέλλειν (stéllein, “send”).
Etymology from Wiktionary, CC BY-SA 3.0