[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. 2018
Word Origin and History for dilatational
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.