Webster's English Dictionary

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halogen

halo.gen \'hal-*-j*n\ \ha-'la:j-*-n*s\ n [Sw] : any of the five elements 
   fluorine, chlorine, bromine, iodine, and astati ne forming part of group 
   Vii A of the periodic table and existing in the free state normally as 
   diatomic molecules - ha.log.e.nous aj