mouth·wash | \ˈmau̇th-ˌwȯsh, -ˌwäsh\

Definition of mouthwash 

: a usually antiseptic liquid preparation for cleaning the mouth and teeth or freshening the breath

Examples of mouthwash in a Sentence

Recent Examples on the Web

That may explain your success with this unorthodox use of mouthwash. Houston Chronicle, "Old wives’ remedy helped arthritis pain," 1 July 2018 Researchers looked at mouthwash samples from the participants, about 25 percent of whom identified as non-drinkers, 59 percent as moderate drinkers and 15 percent as heavy drinkers. Jason Lemon, ajc, "Heavy drinking may increase 'bad' bacteria in your mouth, study finds," 30 Apr. 2018 Therapeutic mouthwash is available by prescription and over the counter. Lindsey Lanquist, SELF, "Your Tongue Is Probably Filthy, Here’s How to Clean It," 18 Mar. 2018 Plus there are a lot of dangerous products in there — mouthwash, medicine, razors., "Fixer Upper's Clint Harp on the 5 Places You Must Babyproof — and the Surprising Spot Most Parents Forget," 6 July 2018 Avoiding acidic and spicy foods and using a mouthwash of ¼ teaspoon salt with one cup of water can also help ease your symptoms, Chirino says. Korin Miller, SELF, "11 Common Chemotherapy Side Effects, Plus How to Ease Them," 18 June 2018 The latest poll from Hyatt suggests guests don't pack their razors, toothbrushes and mouthwash. Christopher Elliott, USA TODAY, "Road trip essentials: Clean utensils and a deck of cards?," 16 June 2018 First responders said Sierra had a bottle of mouthwash in his lap. Ajc Homepage, ajc, "Police: Serial DWI offender found passed out behind the wheel in middle of busy highway," 7 Apr. 2018 Can’t malign the perception of the product, and make no mistake, the NFL is a product, as carefully marketed as a mouthwash or detergent. Kevin Williams,, "NFL's shortsighted anthem policy spits in the face of American ideals," 23 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mouthwash.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of mouthwash

1840, in the meaning defined above

Keep scrolling for more

Learn More about mouthwash

Statistics for mouthwash

Last Updated

24 Aug 2018

Look-up Popularity

Time Traveler for mouthwash

The first known use of mouthwash was in 1840

See more words from the same year

Keep scrolling for more

More Definitions for mouthwash



English Language Learners Definition of mouthwash

: a liquid that is used to clean your mouth and teeth and to make your breath smell better


mouth·wash | \ˈmau̇th-ˌwȯsh, -ˌwäsh \

Medical Definition of mouthwash 

: a liquid preparation (as an antiseptic solution) for cleansing the mouth and teeth

called also collutorium

Keep scrolling for more

Comments on mouthwash

What made you want to look up mouthwash? Please tell us where you read or heard it (including the quote, if possible).


a generally accepted meaning of a word

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble-tiles-that-read-scrabble-quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!