the act of regurgitating.
voluntary or involuntary return of partly digested food from the stomach to the mouth.
Pathology. the reflux of blood through defective heart valves.

1595–1605; < Medieval Latin regurgitātiōn- (stem of regurgitātiō). See regurgitate, -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
regurgitate (rɪˈɡɜːdʒɪˌteɪt)
1.  to vomit forth (partially digested food)
2.  (of some birds and certain other animals) to bring back to the mouth (undigested or partly digested food with which to feed the young)
3.  (intr) to be cast up or out, esp from the mouth
4.  (intr) med (of blood) to flow backwards, in a direction opposite to the normal one, esp through a defective heart valve
[C17: from Medieval Latin regurgitāre, from re- + gurgitāre to flood, from Latin gurges gulf, whirlpool]
n, —adj

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

c.1600, from M.L. regurgitationem, noun of action from regurgitare "to overflow," from L.L. re- "back" + gurgitare "engulf, flood" (found in L. ingurgitare "to pour in"), from gurges "whirlpool, gorge, abyss." Meaning "to vomit" first attested 1753.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
regurgitation   (rē-gûr'jĭ-tā'shən)  Pronunciation Key 
The return of partially digested food from the stomach to the mouth.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It prevents the regurgitation of blood into the sinus during the contraction of
  the atrium.
Estimates are not purely regurgitation of models but fits of models to data.
Accurate regurgitation is prized over original thought.
Longer days of memorization and regurgitation will not solve this problem.
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