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Halmahera
halo
halo-
halo effect
halobiont
halocarbon
halocline
haloform
halogen
halogenate
halon
haloperidol
halophile
halophyte
halosere
halothane
haloumi
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halogen

hal·o·gen [ hálləjən ]


noun  (plural hal·o·gens)
Definition:
 
electronegative chemical element: any of the five electronegative elements, namely fluorine, chlorine, iodine, bromine, or astatine



adjective 
Definition:
 
using halogen: describes lamps or heat sources that have a filament surrounded by halogen vapor
a halogen bulb

[Mid-19th century. <halo-; because they readily form salts when combined with metals]
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