halogen

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

Origin of halogen

First recorded in 1835–45; halo- + -gen
Related formsha·log·e·nous [ha-loj-uh-nuh s] /hæˈlɒdʒ ə nəs/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for halogen

bleach, disinfectant, halogen

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British Dictionary definitions for halogen

halogen

noun
  1. any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
Derived Formshalogenoid, adjectivehalogenous (həˈlɒdʒɪnəs), adjective

Word Origin for halogen

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

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

halogen in Medicine

halogen

[hălə-jən]
n.
  1. 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.

halogen in Science

halogen

[hălə-jən]
  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.