chlorine

noun

chlo·​rine ˈklȯr-ˌēn 

-ən

: 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

Most sheet gaskets, a type of seal, that contain asbestos will be banned after two years, while the chlor-alkali sector, which makes chemicals like chlorine for treating water, would have up to 12 years to make the change. —Rachel Frazin, The Hill, 17 June 2025

Currently, intensive industrial manufacturing of asphalt, corrosive acid, chlorine and insecticides, as well as warehousing, wholesaling and freight movement, are permitted in certain zoning districts. —Adriana Pérez, Chicago Tribune, 17 June 2025

While use of chrysotile asbestos was on the decline, the dangerous mineral has lingered in various gaskets, brake blocks, aftermarket automotive brakes and linings, other vehicle friction products, and some diaphragms used to make sodium hydroxide and chlorine. —ArsTechnica, 17 June 2025

Proper eye protection Sand, sunscreen, chlorine, saltwater, and UV rays: This summer fivesome can leave your eyes itchy, sore, and sensitive. —Amelia McBride, Travel + Leisure, 15 June 2025

Word History

First Known Use

1810, in the meaning defined above

Phrases Containing chlorine

• chlorine dioxide
• chlorine monoxide

Rhymes for chlorine

• organochlorine

Kids Definition

chlorine

noun

chlo·​rine ˈklō(ə)r-ˌēn 

ˈklȯ(ə)r-,

-ən

: a nonmetallic element that is found alone as a heavy greenish yellow irritating gas having two atoms per molecule and a strong odor and that is used especially as a bleach, oxidizing agent, and disinfectant in water purification see element

Medical Definition

chlorine

noun

chlo·​rine ˈklō(ə)r-ˌēn, ˈklȯ(ə)r-, -ən 

: 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