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[dahy-as-tuh-sis] /daɪˈæs tə sɪs/
noun, plural diastases
[dahy-as-tuh-seez] /daɪˈæs təˌsiz/ (Show IPA)
Medicine/Medical. the separation of normally joined parts, as in the dislocation of bones, without fracture.
Physiology. the diastolic rest period immediately preceding systole.
Origin of diastasis
1735-45; < New Latin < Greek diástasis a separation. See dia-, stasis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for diastasis


noun (pl) -ses (-ˌsiːz)
  1. the separation of an epiphysis from the long bone to which it is normally attached without fracture of the bone
  2. the separation of any two parts normally joined
(physiol) the last part of the diastolic phase of the heartbeat
Derived Forms
diastatic (ˌdaɪəˈstætɪk) adjective
Word Origin
C18: New Latin, from Greek: a separation, from diistanai to separate, from dia- + histanai to place, make stand
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
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diastasis in Medicine

diastasis di·as·ta·sis (dī-ās'tə-sĭs)

  1. Separation of normally joined parts, such as the separation of certain abdominal muscles during pregnancy. Also called divarication.

  2. The last stage of diastole in the heart, occurring just before contraction and during which little additional blood enters the ventricle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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