any chemical that destroys life by poisoning, especially a pesticide, herbicide, or fungicide.

1945–50; bio- + -cide

biocidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biocide (ˈbaɪəˌsaɪd)
a chemical, such as a pesticide, capable of killing living organisms

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"destruction of living tissue or living species," 1947, from bio- + -cide.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
biocide   (bī'ə-sīd')  Pronunciation Key 
A chemical agent, such as a pesticide or herbicide, that is capable of destroying living organisms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Formaldehyde, being a biocide as well as a carcinogen, kills bacteria that may
  be lurking in the shampoo.
Valiant attempts will certainly be made to defend the motives and methods of
  biocide users.
If a biocide is used, follow the manufacturer's instructions for proper
It is also used as a biocide for cutting oils and aqueous systems such as
  leather tanning and paper manufacturing.
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