[dahy-as-tl-ee, -tl-ee]
  1. Physiology. the normal rhythmical dilatation of the heart during which the chambers are filling with blood.Compare systole(def 1).
  2. Prosody. the lengthening of a syllable regularly short, especially before a pause or at the ictus.

Origin of diastole

1570–80; < Late Latin diastolē < Greek diastolḗ a putting asunder, dilation, lengthening; compare diastéllein to set apart, equivalent to dia- dia- + stéllein to put, place
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for diastole

Historical Examples of diastole

British Dictionary definitions for diastole


  1. the dilatation of the chambers of the heart that follows each contraction, during which they refill with bloodCompare systole
Derived Formsdiastolic (ˌdaɪəˈstɒlɪk), adjective

Word Origin for diastole

C16: via Late Latin from Greek: an expansion, from diastellein to expand, from dia- + stellein to place, bring together, make ready
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for diastole

1570s, from medical Latin diastole, from Greek diastole "drawing asunder, dilation," from diastellein, from dia- "through, thoroughly, entirely" (see dia-) + stellein "to set in order, arrange, array, equip, make ready," from PIE *stel-yo-, suffixed form of root *stel- "to put, stand," with derivatives referring to a standing object or place (see stall (n.1)).

Online Etymology Dictionary, © 2010 Douglas Harper

diastole in Medicine


  1. The normal rhythmically occurring relaxation and dilatation of the heart chambers, especially the ventricles, during which they fill with blood.
Related formsdi′a•stolic (dī′ə-stŏlĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

diastole in Science


  1. The period during the normal beating of the heart in which the chambers of the heart dilate and fill with blood. Diastole of the atria occurs before diastole of the ventricles. Compare systole.
Related formsdiastolic adjective (dī′ə-stŏlĭk)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.