a flowing back; ebb.

1400–50; late Middle English < Medieval Latin refluxus. See re-, flux Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reflux (ˈriːflʌks)
1.  chem to boil or be boiled in a vessel attached to a condenser, so that the vapour condenses and flows back into the vessel
2.  chem
 a.  an act of refluxing
 b.  (as modifier): a reflux condenser
3.  the act or an instance of flowing back; ebb
[C15: from Medieval Latin refluxus, from Latin refluere to flow back]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1430, "a flowing back (of the sea, etc.)," from M.L. refluxus, from L. re- "back, again" + fluxus "a flowing" (see flux). Digestive sense is recorded from 1937.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

reflux re·flux (rē'flŭks')

  1. A flowing back.

  2. The process of refluxing.

v. re·fluxed, re·flux·ing, re·flux·es
To boil a liquid in a vessel attached to a condenser so that the vapors continuously condense for reboiling.
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
At the same time, he heaves the land with an earthquake, and brings in the
  reflux of the ocean over the shores.
Most veins are provided with valves which serve to prevent the reflux of the
The chart notes told me that he was being treated for persistent
  gastroenterological reflux.
New government figures show a worrisome increase in esophagus disorders from
  severe acid reflux.
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