Hypertext Webster Gateway: "halogen"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Halogen \Hal"o*gen\, n. [Gr. "a`ls, "alo`s, salt + -gen: cf. F.
halog[`e]ne.] (Chem.)
An electro-negative element or radical, which, by combination
with a metal, forms a haloid salt; especially, chlorine,
bromine, and iodine; sometimes, also, fluorine and cyanogen.
See {Chlorine family}, under {Chlorine}.
From WordNet (r) 1.7 (wn)
halogen
n : any of the chemical elements fluorine or chlorine or bromine
or iodine or astatine
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