halogen ( synonym found)
Definition of halogen:

(n) : any element of group 7, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal
Definition of halogen:

(n) : any element of group 7, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal
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