[ ree-fluhks ]
/ ˈriˌflʌks /


a flowing back; ebb.

Origin of reflux

First recorded in 1400–50; late Middle English word from Medieval Latin word refluxus. See re-, flux Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for reflux

British Dictionary definitions for reflux


/ (ˈriːflʌks) /


chem to boil or be boiled in a vessel attached to a condenser, so that the vapour condenses and flows back into the vessel


  1. an act of refluxing
  2. (as modifier)a reflux condenser
the act or an instance of flowing back; ebb

Word Origin for reflux

C15: from Medieval Latin refluxus, from Latin refluere to flow back
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for reflux



early 15c., "a flowing back (of the sea, etc.)," from Medieval Latin refluxus, from Latin re- "back, again" (see re-) + fluxus "a flowing" (see flux). Digestive sense is recorded from 1937.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for reflux


[ rēflŭks′ ]


A flowing back.
The process of refluxing.


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.