halogen

Etymology

From Ancient Greek ἅλς (háls, “salt" or "sea”) + γεν- (gen-), "to produce" (coined by Berzelius in 1842).

noun

  1. (chemistry) Any element of group 17, i.e. fluorine, chlorine, bromine, iodine, astatine and tennessine, which form a salt by direct union with a metal.
  2. A light fixture in which the filament is surrounded by an atmosphere of a halogen gas,

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