[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
Examples from the Web for dilatation
It seems to be as applicable to the dilatation of the heart, as to that of an artery.Cases of Organic Diseases of the Heart
John Collins Warren
In these cases the tubular form may rather be due to dilatation than to cohesion.Vegetable Teratology
Maxwell T. Masters
There may be dilatation of the pupil, but this is not seen in all.
The systole of the heart means its contraction: the diastole of the heart means its dilatation.William Harvey
By compression or dilatation, they are changed to double refractors of light.The Boy's Playbook of Science
John Henry Pepper
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
- 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.