SG Heritage Dictionary

Halogen [Noun] Webster's Dictionary 1913

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.

Halogenous [Adjective] Webster's Dictionary 1913

Of the nature of a halogen.