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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 hal·o·gen /ˈhæləʤən/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 halo·gen /ˈhæləʤən/ 名詞

From: Webster's Revised Unabridged Dictionary (1913)

 Hal·o·gen n.  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.

From: WordNet (r) 2.0

      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