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halogen British & World English

Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive non-metallic elements which form strongly acidic compounds with hydrogen from which simple salts can be made

quartz-halogen British & World English

(Of a high-intensity electric lamp) using a quartz bulb containing the vapour of a halogen, usually iodine