[hal-uh-juhn, -jen, hey-luh-]
noun Chemistry.
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.

1835–45; halo- + -gen

halogenous [ha-loj-uh-nuhs] , adjective
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World English Dictionary
halogen (ˈhæləˌdʒɛn)
any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
[C19: from Swedish; see halo-, -gen]

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Word Origin & History

1842, from Swedish, coined by Swed. chemist Baron Jöns Jakob Berzelius (1779-1848) from Gk. hals (gen. halos) "salt" + -gen "to produce;" so called because a salt is formed in reactions involving these elements.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

halogen hal·o·gen (hāl'ə-jən)
Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
halogen   (hāl'ə-jən)  Pronunciation Key 
Any of a group of five nonmetallic elements with similar properties. The halogens are fluorine, chlorine, bromine, iodine, and astatine. Because they are missing an electron from their outermost shell, they react readily with most metals to form salts. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
No visible shadows, not with them new halogen overheads.
On one side of the cylindrical chamber, about halfway down its length, is a
  halogen movie-projector lamp.
For each cook who swears by halogen cooktops, another swears at them.
Other energy-efficient lighting options include halogen incandescent bulbs and
  compact fluorescent lamps.
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