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

 

halogen

 noun
noun
BrE BrE//ˈhælədʒən//
 
; NAmE NAmE//ˈhælədʒən//
 
(chemistry)
 
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any of a set of five chemical elements, including fluorine, chlorine and iodine, that react with hydrogen to form acids from which simple salts can be made. Halogens, in the form of gas, are used in lamps and cookers/stoves. Word Origin mid 19th cent.: from Greek hals, halo- ‘salt’ + -gen.
See the Oxford Advanced American Dictionary entry: halogen