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| hal·o·gen [ hálləjən ] |
noun (plural hal·o·gens) |
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electronegative chemical element: any of the five electronegative elements, namely fluorine, chlorine, iodine, bromine, or astatine
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adjective |
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using halogen: describes lamps or heat sources that have a filament surrounded by halogen vapor
 a halogen bulb
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| [Mid-19th century. <halo-; because they readily form salts when combined with metals] |
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