[mouth-wawsh, -wosh]
a solution, often containing antiseptic, astringent, and breath-sweetening agents, used for cleansing the mouth and teeth, and for gargling.
Also called collutory, collutorium.

1830–40; mouth + wash Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mouthwash (ˈmaʊθˌwɒʃ)
a medicated aqueous solution, used for gargling and for cleansing the mouth

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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American Heritage
Medical Dictionary

mouthwash mouth·wash (mouth'wŏsh')
A medicated liquid for cleaning the mouth and treating diseased mucous membranes. Also called collutory.

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
We cannot take mouthwash on a plane for fear it will somehow take over the
Patients with braces are often given prescription toothpaste and mouthwash that
  contain high levels of fluoride.
It's not surprising that bleach wipes, antibiotic mouthwash, and antiseptic
  wipes are way overused.
Also remember to take along your toothbrush, toothpaste, floss and mouthwash to
  keep your teeth clean.
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