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Meaning of halogen

hal•o•gen

Pronunciation: (hal'u-jun, -jen", hā'lu-), [key]
— n. Chem.
  1. any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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