a substance or preparation used for killing insects.
the act of killing insects.

1860–65; insect + -i- + -cide

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

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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American Heritage
Medical Dictionary

insecticide in·sec·ti·cide (ĭn-sěk'tĭ-sīd')
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 for insecticides
This, in contrast, requires fewer insecticides to be applied to the crop.
Zoos sometimes use chickens instead of insecticides to control insect
Boric acid and borax are often used as insecticides that are relatively safe
  for humans.
Many bedbugs have grown resistant to the weaker insecticides.
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