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halogen

[hal-uh-juh n, -jen, hey-luh-] /ˈhæl ə dʒən, -ˌdʒɛn, ˈheɪ lə-/
noun, Chemistry
1.
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.
Origin
1835-1845
1835-45; halo- + -gen
Related forms
halogenous
[ha-loj-uh-nuh s] /hæˈlɒdʒ ə nəs/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for halogen
  • No visible shadows, not with them new halogen overheads.
  • Methane is violently reactive with oxidizers, halogens, and some halogen-containing compounds.
  • 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.
  • The wiring loom uses recycled and halogen-free materials instead of polyvinyl, a move intended to make it more easily recycled.
  • When you flick the switch, the halogen bulb lights instantly.
  • When you switch it on, the box shines a halogen light on the cup and casts a colorful shadow onto the wall.
  • That's the equivalent light that comes from a standard halogen lamp, at a fraction of the power.
  • The light, falling from rows of halogen lamps in the ceiling high overhead, is even and brilliant.
British Dictionary definitions for halogen

halogen

/ˈhæləˌdʒɛn/
noun
1.
any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
Derived Forms
halogenoid, adjective
halogenous (həˈlɒdʒɪnəs) adjective
Word Origin
C19: from Swedish; see halo-, -gen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for halogen
n.

general name for elements of the chlorine family, 1842, from Swedish, coined by Swedish chemist Baron Jöns Jakob Berzelius (1779-1848), literally "salt-producer," from Greek hals "salt" (see halo-) + -gen "giving birth to" (see -gen); so called because a salt is formed in reactions involving these four elements.

Online Etymology Dictionary, © 2010 Douglas Harper
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halogen in Medicine

halogen hal·o·gen (hāl'ə-jən)
n.
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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halogen in Science
halogen
  (hāl'ə-jən)   
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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