chlo·​rine | \ ˈklȯr-ˌēn How to pronounce chlorine (audio) , -ən\

Definition of chlorine

: a halogen element that is isolated as a heavy greenish-yellow diatomic gas of pungent odor and is used especially as a bleach, oxidizing agent, and disinfectant in water purification — see Chemical Elements Table

Examples of chlorine in a Sentence

Recent Examples on the Web

Many municipalities in the United States add fluoride to tap water to prevent tooth decay, so watering your plants once a week with fluoride-free bottled water may reduce or even eliminate fluoride, chlorine, and salts. Willi Evans Galloway, Good Housekeeping, "How to Grow Extra-Lush Lucky Bamboo," 20 Aug. 2018 Repeat the process using another soft cloth dipped in water to gently sponge away the chlorine, but don't rub or oversaturate the paper. Lauren Smith, Good Housekeeping, "How to Get Rid of Mold and Mildew in the Mustiest Corners of Your House," 6 Feb. 2019 Hard to kill Standard chlorine takes a long time to kill the cryptosporidium bacteria. Agnel Philip, azcentral, "Pool season is crypto season: How to lower the odds of getting infected," 26 May 2018 Not wanting to lose their American customers, proprietors of bars, restaurants and other businesses along Avenida Revolución helped raised money to get the chlorine. Michael Smolens,, "Tijuana sewage spills: generations of frustration," 18 Feb. 2018 LiBa's clear shower-curtain liner is made from chlorine-free PEVA, an odorless material that works as a replacement for PVC, which is what most shower-curtain liners are made with. Brittney Morgan, House Beautiful, "This Is The Best-Selling Shower Curtain Liner on Amazon, And It’s Only $10," 16 Jan. 2019 Mix 1 gallon of water with 1 teaspoon of liquid chlorine bleach. Caroline Picard, Good Housekeeping, "How to Clean a Humidifier, According to the Good Housekeeping Institute," 4 Jan. 2019 This includes chlorine tablet containers, brushes, skim baskets, and poles. Timothy Dahl, Popular Mechanics, "How to Winterize Your Pool," 25 Oct. 2018 Up to ten Lockheed Martin employees could’ve been exposed to chlorine, the company said Wednesday. Bianca Padró Ocasio,, "Lockheed Martin employees exposed to chlorine, fire rescue says," 27 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'chlorine.' 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 chlorine

1810, in the meaning defined above

Keep scrolling for more

Learn More about chlorine

Statistics for chlorine

Last Updated

27 Feb 2019

Look-up Popularity

Time Traveler for chlorine

The first known use of chlorine was in 1810

See more words from the same year

Keep scrolling for more

More Definitions for chlorine



English Language Learners Definition of chlorine

: a chemical that in its natural form is a greenish-yellow gas and has a strong smell


chlo·​rine | \ ˈklȯr-ˌēn How to pronounce chlorine (audio) , -ən\

Kids Definition of chlorine

: a chemical element that is a greenish yellow irritating gas of strong odor used as a bleach and as a disinfectant to purify water


chlo·​rine | \ ˈklō(ə)r-ˌēn, ˈklȯ(ə)r-, -ən How to pronounce chlorine (audio) \

Medical Definition of chlorine

: a halogen element that is isolated as a heavy greenish yellow gas of pungent odor and is used especially as a bleach, oxidizing agent, and disinfectant in water purification symbol Cl — see Chemical Elements Table

Keep scrolling for more

More from Merriam-Webster on chlorine

Rhyming Dictionary: Words that rhyme with chlorine

Spanish Central: Translation of chlorine

Nglish: Translation of chlorine for Spanish Speakers

Britannica English: Translation of chlorine for Arabic Speakers Encyclopedia article about chlorine

Comments on chlorine

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


the range of authority or knowledge

Get Word of the Day daily email!

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt-painting-a-young-scholar-and-his-tutor
  • Which of the following is the earliest known sense of the word awe?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Word Winder's CrossWinder

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!