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Definition of: halogen
Our photo definition of halogen 
(hal′ə·jən) noun Chem.
One of certain non-metallic elements belonging to the seventh group in the periodic table, as iodine, fluorine, chlorine, and bromine, which combine directly with metals to form halides. [<Gk. hals sea, salt + -GEN]
—ha·log·e·nous (hə·loj′ə·nəs) adjective
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