halogen
Pronunciation
  • (RP) IPA: /ˈhæ.ləˌd͡ʒən/, /ˈheɪ.lə.d͡ʒən/
  • (GA) IPA: /ˈhæ.lə.d͡ʒən/
Noun

halogen (plural halogens)

  1. (chemistry) Any element of group 17, i.e. fluorine, chlorine, bromine, iodine and astatine, 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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