a chemical preparation for destroying plant, fungal, or animal pests.
Also called biocide.

1935–40; pest + -i- + -cide

pesticidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pesticide (ˈpɛstɪˌsaɪd)
a chemical used for killing pests, esp insects and rodents

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

1939, a hybrid coined from Eng. pest (q.v.) + -cide.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pesticide pes·ti·cide (pěs'tĭ-sīd')
A chemical used to kill pests, especially insects.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pesticide  [%PREMIUM_LINK%]     (pěs'tĭ-sīd')  Pronunciation Key 
A chemical used to kill harmful animals or plants. Pesticides are used especially in agriculture and around areas where humans live. Some are harmful to humans, either from direct contact or as residue on food, or are harmful to the environment because of their high toxicity, such as DDT (which is now banned in many countries). Pesticides include fungicides, herbicides, insecticides, and rodenticides. See more at fungicide, herbicide, insecticide.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Several different pathogens threaten it, prompting farmers to use ever more
Older generations of bedbugs weren't resistant to pesticides and lived in
  tougher environments: houses without central heating.
The mosquitoes that carry it have become resistant to pesticides, the parasite
  itself to antimalarial drugs.
And don't try to tell me that evolution explains why insects develop immunity
  to pesticides.
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