HALOGEN

halogen

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

Source: WordNet® 3.1

Etymology

Noun

halogen (plural halogens)

(chemistry) Any element of group 17, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal.

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

Source: Wiktionary

Hal"o*gen, n. Etym: [Gr. "a`ls, "alo`s, salt + -gen: cf. F. halogène.] (Chem.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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