halogen - definition of halogen - synonyms, pronunciation, spelling from Free Dictionary

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Noun (1)halogens

any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ionsType of group, groupingKinds chlorine, iodine, fluorine, bromine, astatine

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Webster's Dictionary (1913)

Hal′o·gen (hăl′ō-jĕn), noun

Origin: Gr. ἅλς, ἁλός, salt + -gen: cf. F. halogène.

Chemistry An electro-negative element or radical, which, by combination with a metal, forms a haloid salt; especially, chlorine, fluorine, bromine, and iodine; sometimes, also cyanogen. See Chlorine family, under Chlorine.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54