dilatation

[dil-uh-tey-shuhn, dahy-luh-]
noun
1.
a dilated formation or part.
2.
Pathology. an abnormal enlargement of an aperture or a canal of the body.
3.
Surgery.
a.
an enlargement made in a body aperture or canal for surgical or medical treatment.
b.
a restoration to normal patency of an abnormally small body opening or passageway, as of the anus or esophagus.
4.
Mechanics. the increase in volume per unit volume of a homogeneous substance.
Also, dilation.


Origin:
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

dilatational, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dilate (daɪˈleɪt, dɪ-)
 
vb
1.  to expand or cause to expand; make or become wider or larger: the pupil of the eye dilates in the dark
2.  (intr; often foll by on or upon) to speak or write at length; expand or enlarge
 
[C14: from Latin dīlātāre to spread out, amplify, from dis- apart + lātus wide]
 
di'latable
 
adj
 
dilata'bility
 
n
 
di'latableness
 
n
 
di'lation
 
n
 
dilatation
 
n
 
dila'tational
 
adj
 
dilative
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

dilatation
c.1400; see dilation.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dilatation dil·a·ta·tion (dĭl'ə-tā'shən, dī'lə-)
n.
Physiological, pathological, or artificial enlargement of a cavity, canal, blood vessel, or opening.

The American Heritage® Stedman's Medical Dictionary
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