insecticide

[in-sek-tuh-sahyd]
noun
1.
a substance or preparation used for killing insects.
2.
the act of killing insects.

Origin:
1860–65; insect + -i- + -cide

insecticidal, adjective
noninsecticidal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insecticide (ɪnˈsɛktɪˌsaɪd)
 
n
a substance used to destroy insect pests
 
insecti'cidal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

insecticide in·sec·ti·cide (ĭn-sěk'tĭ-sīd')
n.
A chemical substance that kills insects.


in·sec'ti·cid'al (-sīd'l) adj.
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
insecticide  [%PREMIUM_LINK%]     (ĭn-sěk'tĭ-sīd')  Pronunciation Key 
A pesticide used to kill insects. Chlordane and DDT are insecticides. Compare fungicide, herbicide, rodenticide.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But nobody ever thought to stop us or suggest that it was perhaps unwise to be
  scampering through choking clouds of insecticide.
Mosquitoes swarm at night, and nobody has come to spray with insecticide.
Insecticide poisoning occurs when someone swallows or breathes in this
  substance.
It lasted twice as long as the next best insecticide, and cost one-fourth as
  much.
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