halogen

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈhæləˌdʒɛn/

US:USA pronunciation: IPAUSA pronunciation: IPA/ˈhælədʒən, -ˌdʒɛn, ˈheɪlə-/

US:USA pronunciation: respellingUSA pronunciation: respelling(hal′ə jən, -jen′, hā′lə-)

hal•o•gen /ˈhælədʒən, -ˌdʒɛn, ˈheɪlə-/USA pronunciation n.

Chemistryany of various elements, as fluorine, chlorine, iodine, and bromine, that have properties in common: [uncountable]the use of halogen in lamps.[countable]halogens as health hazards.

hal•o•gen (hal′ə jən, -jen′, hā′lə-),USA pronunciation n. [Chem.]

Chemistryany of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.

Collins Concise English Dictionary © HarperCollins Publishers::

halogen /ˈhæləˌdʒɛn/ n

any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions

Etymology: 19th Century: from Swedish; see halo-, -genhalogenous /həˈlɒdʒɪnəs/ adj

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