Definition of chlorine noun from the Oxford Advanced Learner's Dictionary

 

chlorine

 noun
noun
BrE BrE//ˈklɔːriːn//
 
; NAmE NAmE//ˈklɔːriːn//
 
[uncountable](symbol Cl) Swimming
 
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a chemical element. Chlorine is a poisonous greenish gas with a strong smell. It is often used in swimming pools to keep the water clean. See related entries: Swimming Word Origin early 19th cent.: named by Sir Humphrey Davy, from Greek khlōros ‘green’ + -ine.
See the Oxford Advanced American Dictionary entry: chlorine