halogen
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halogen
any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Halogen
A type of incandescent lamp with a higher energy efficiency than standard ones.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
halogen
[′hal·ə·jən] (chemistry)
Any of the elements of the halogen family, consisting of fluorine, chlorine, bromine, iodine, and astatine.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.