[ 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.


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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


dil·a·ta·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for dilatation

Medical definitions for dilatation

[ dĭl′ə-tāshən, 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.