chlo·​rine | \ˈklȯr-ˌēn, -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

The attacks wouldn’t have an impact on their ability to use chlorine, which can be legally purchased, and other chemicals may be stored in warehouses that weren't struck. Jim Michaels, USA TODAY, "U.S. airstrikes unlikely to deter Bashar Assad from future chemical attacks in Syria," 16 Apr. 2018 Syria is known to possess several types of chemical agents, including blister agents, mustard gas, nerve agents, and chlorine, with the last two being used the most in recent years. David Hambling, Popular Mechanics, "These Are Syria's Chemical Weapons. Here's How To Destroy Them," 13 Apr. 2018 Many are leaving out plasticizers, phthalates, formaldehyde, chlorine, halogen and heavy metals. Clare Miers, star-telegram, "Wallpaper is back! Here, local design experts talk the trends and share their picks | Fort Worth Star-Telegram," 15 Mar. 2018 Several infants, among more than a dozen said to be exposed to chlorine, receive treatment. Mohammed Badra,, "A Photographer Bears Witness to a Suspected Chlorine Attack in Syria," 28 Feb. 2018 And not only lead, but trihalomethane (TTHM) – a chemical byproduct of chlorine disinfectant. Richard Horan, The Christian Science Monitor, "'The Poisoned City' tells the horrific story of Flint's contaminated water," 10 July 2018 Avoid chlorine as much as possible or rinse off immediately after swimming. Alexandra Macon, Vogue, "32 Million Americans Suffer From This Skin Condition—Is Your Baby One of Them?," 9 July 2018 Boynton Beach residents may notice a slight chlorine taste or odor in their drinking water as the city modifies its disinfection process from July 30 through Aug. 17. Kari Barnett,, "Boynton Beach plans to flush water lines with chlorine," 9 July 2018 If a slight chlorine odor is not detectable, repeat the dosage and let stand for 15 minutes more., "Here's what you should buy for your home should disaster strike," 8 July 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

6 Nov 2018

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, -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 \

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

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).


playful or foolish behavior

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

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!