[dil-uh-tey-shuh n, dahy-luh-]
a dilated formation or part.
Pathology. an abnormal enlargement of an aperture or a canal of the body.
- an enlargement made in a body aperture or canal for surgical or medical treatment.
- 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.
Origin of dilatation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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
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.