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[dahy-as-tl-ee, -tl-ee] /daɪˈæs tlˌi, -tl i/
Physiology. the normal rhythmical dilatation of the heart during which the chambers are filling with blood.
Compare systole (def 1).
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for diastole


the dilatation of the chambers of the heart that follows each contraction, during which they refill with blood Compare systole
Derived Forms
diastolic (ˌdaɪəˈstɒlɪk) adjective
Word Origin
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
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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
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diastole in Medicine

diastole di·as·to·le (dī-ās'tə-lē)
The normal rhythmically occurring relaxation and dilatation of the heart chambers, especially the ventricles, during which they fill with blood.

di'a·stol'ic (dī'ə-stŏl'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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diastole in Science
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.

diastolic adjective (dī'ə-stŏl'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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