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

 

halon

 noun
noun
BrE BrE//ˈheɪlɒn//
 
; NAmE NAmE//ˈheɪlɑːn//
 
(chemistry)
 
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a gas that is made up of carbon and one or more halogens, used especially to stop fires Word Origin 1960s: from halogen + -on.
See the Oxford Advanced American Dictionary entry: halon