Definition of halogen
(Entry 1 of 2)
: any of the five elements fluorine, chlorine, bromine, iodine, and astatine that form part of group VIIA of the periodic table and exist in the free state normally as diatomic molecules
halogen
adjectiveDefinition of halogen (Entry 2 of 2)
: containing, using, or being a halogen
a halogen lamp
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Time Traveler for halogen
The first known use of halogen was in 1842
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