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halogens

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Halogens
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hal⋅o⋅gen

  [hal-uh-juhn, -jen, hey-luh-]
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–noun Chemistry.
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.
Origin:
1835–45; halo- + -gen

Related forms:
ha⋅log⋅e⋅nous  [ha-loj-uh-nuhs] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Halogens
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hal·o·gen   (hāl'ə-jən)   
n.  Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.

[Swedish : halo-, halo- + -gen, -gen.]
ha·log'e·nous (hā-lŏj'ə-nəs) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

halogen 
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, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: halo·gen
Pronunciation: 'hal-&-j&n
Function: noun
: any of the five elements fluorine, chlorine, bromine, iodine, and astatinethat form part of group VII A of the periodic table and exist in the free state normally as diatomic molecules —ha·log·e·nous /ha-'läj-&-n&s/ adjective
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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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