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[dil-uh-tey-shuh n, dahy-luh-] /ˌdɪl əˈteɪ ʃən, ˌdaɪ lə-/
a dilated formation or part.
Pathology. an abnormal enlargement of an aperture or a canal of the body.
  1. an enlargement made in a body aperture or canal for surgical or medical treatment.
  2. a restoration to normal patency of an abnormally small body opening or passageway, as of the anus or esophagus.
Mechanics. the increase in volume per unit volume of a homogeneous substance.
Also, dilation.
Origin of dilatation
1350-1400; Middle English (< Old French) < Latin dīlātātiōn- (stem of dīlātātiō), equivalent to dīlātāt(us) spread out (past participle of dīlātāre to dilate) + iōn- -ion
Related forms
dilatational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for dilatation
  • Parents, children, and doctors closely monitor the extent of dilatation of the aortic root and openly discuss consequences.
  • Interested, you refer to relativistic time dilatation.
Word Origin and History for dilatation

c.1400, from Old French dilatation, from Late Latin dilatationem (nominative dilatatio) "a widening," from past participle stem of Latin dilatare (see dilate).

Online Etymology Dictionary, © 2010 Douglas Harper
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dilatation in Medicine

dilatation dil·a·ta·tion (dĭl'ə-tā'shən, dī'lə-)
Physiological, pathological, or artificial enlargement of a cavity, canal, blood vessel, or opening.

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