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polychlorinated biphenyl

[pol-ee-klawr-uh-ney-tid, -klohr-] /ˌpɒl iˈklɔr əˌneɪ tɪd, -ˈkloʊr-/
noun, Chemistry
1.
PCB.
Origin
1960-1965
1960-65; poly- + chlorinated
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for polychlorinated biphenyl

polychlorinated biphenyl

/ˌpɒlɪˈklɔːrɪˌneɪtɪd/
noun
1.
any of a group of compounds in which chlorine atoms replace the hydrogen atoms in biphenyl: used in industry in electrical insulators and in the manufacture of plastics; a toxic pollutant that can become concentrated in animal tissue PCB
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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polychlorinated biphenyl in Medicine

polychlorinated biphenyl pol·y·chlo·rin·at·ed biphenyl (pŏl'ē-klôr'ə-nā'tĭd)
n.
PCB.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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polychlorinated biphenyl in Science
polychlorinated biphenyl
  (pŏl'ē-klôr'ə-nā'tĭd)   
See PCB.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for polychlorinated biphenyl

PCB

any of a class of organohalogen compounds prepared by the reaction of chlorine with biphenyl. A typical mixture of PCBs may contain over 100 compounds and is a colourless, viscous liquid. The mixture is relatively insoluble in water, is stable at high temperatures, and is a good dielectric (electrical insulator). Because of these qualities, PCBs are particularly useful as lubricants, heat-transfer fluids, and fire-resistant insulating fluids in transformers and capacitors.

Learn more about PCB with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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