verb (used with object)
to draw or press in; cause to contract or shrink; compress.
to slow or stop the natural course or development of: Greed and aggressiveness constricted the nation's cultural life.

1375–1425 for earlier past participle sense; 1725–35 for current senses; late Middle English < Latin constrīctus (past participle of constringere to draw together, tie up), equivalent to con- con- + strīc- (variant stem of stringere to tie; see strict) + -tus past participle suffix

nonconstricted, adjective
nonconstricting, adjective
unconstricted, adjective
well-constricted, adjective

1. cramp, squeeze, bind, tighten.

1. expand. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
constrict (kənˈstrɪkt)
1.  to make smaller or narrower, esp by contracting at one place
2.  to hold in or inhibit; limit
[C18: from Latin constrictus compressed, from constringere to tie up together; see constrain]

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

c.1400 (constriction), from L. constrictus, pp. of constringere "compress" (see constrain). A direct borrowing from L. of the same word which, via Fr., became constrain.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

constrict con·strict (kən-strĭkt')
v. con·strict·ed, con·strict·ing, con·stricts
To make smaller or narrower especially by binding or squeezing.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
When the snakes constricted the rats, the hearts were allowed to beat for a
  while, then they were turned off.
It is generally flexuous, and constricted at intervals so as to present a
  varicose appearance.
The lower part of this thickening is soon constricted off, and fibers appear in
  it to form the anterior commissure.
With pure oxygen the kids' breathing quickened and blood vessels constricted,
  preventing oxygen from reaching the brain and heart.
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