(n) a coarse annual herb introduced into North America from Siberia; dangerous to sheep and cattle on western rangelands because of its high oxalate content, Syn.Halogeton glomeratus
(n) any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
n. [ Gr. "a`ls, "alo`s, salt + -gen: cf. F. halogène. ] (Chem.) 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. [ 1913 Webster ]
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