Definition of halogen
: 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
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Origin and Etymology of halogen
Swedish, from hal- + -gen
First Known Use: 1842
2
halogen
adjective
hal·o·gen
Definition of halogen
: containing, using, or being a halogen a halogen lamp
1880
First Known Use of halogen
1880
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Britannica.com: Encyclopedia article about halogen
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