[ 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.

Nearby words

  1. dilapidated,
  2. dilapidation,
  3. dilatancy,
  4. dilatant,
  5. dilatate,
  6. dilatation and curettage,
  7. dilatator,
  8. dilate,
  9. dilation,
  10. dilation and curettage

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 formsdil·a·ta·tion·al, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for 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

Medicine 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.