verb (used with object), convulsed, convulsing.
to shake violently; agitate.
to cause to shake violently with laughter, anger, pain, etc.
to cause to suffer violent, spasmodic contractions of the muscles.

1635–45; < Latin convulsus past participle of convellere to shatter, tear loose, equivalent to con- con- + vul- (variant stem of vellere to pull, tear) + -sus, variant of -tus past participle suffix

convulsedly, adverb
convulsible, adjective
convulsibility, noun
unconvulsed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
convulse (kənˈvʌls)
vb (often foll by with)
1.  (tr) to shake or agitate violently
2.  (tr) to cause (muscles) to undergo violent spasms or contractions
3.  informal to shake or be overcome (with violent emotion, esp laughter)
4.  (tr) to disrupt the normal running of (a country, etc): student riots have convulsed India
[C17: from Latin convulsus, from convellere to tear up, from vellere to pluck, pull]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s, trans.; 1680s, intrans.; from L. convuls-, pp. stem of convellere (trans. only) "to pull away, to pull this way and that, wrench," hence "to weaken, overthrow, destroy" (see convulsion). Related: Convulsed (1630s); convulsing (1829).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

convulse con·vulse (kən-vŭls')
v. con·vulsed, con·vuls·ing, con·vuls·es
To affect with irregular and involuntary muscular contractions; throw into convulsions.

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
It landed on the sidewalk, bounced about three feet, crashed back down and
  convulsed for a couple seconds.
Even as the private world has eclipsed public markets, finance has been
  convulsed by a computer-enhanced frenzy of creativity.
They were then yanked back and the fastening was removed, all of which
  convulsed the choristers.
What started as a problem in subprime loans has now convulsed the entire
  financial system.
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