halogen — English Dictionary

Noun

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

   Broader terms

   nonmetalelementsubstancematerial

   Examples

   More examples (1)

   Plant 12 also stored super sacks of bromochloro-5,5-dimethylimidazolidine-2,4-dione (BCDMH), which is a granular solid oxidizer with a halogen odor that, in addition to chlorine gas and hydrogen chloride, can also release bromine gas and hydrogen bromide upon decomposition.

2. A light fixture in which the filament is surrounded by an atmosphere of a halogen gas.

Noun

1. any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions

   Broader terms

   groupgrouping