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insecticide

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

First recorded in 1860–65; insect + -i- + -cide
Related formsin·sec·ti·cid·al, adjectivenon·in·sec·ti·cid·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for insecticide

insecticide

noun
  1. a substance used to destroy insect pests
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Derived Formsinsecticidal, adjective
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

Word Origin and History for insecticide

n.

"substance which kills insects," 1865, from insect + -cide.

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Online Etymology Dictionary, © 2010 Douglas Harper

insecticide in Medicine

insecticide

(ĭn-sĕktĭ-sīd′)
n.
  1. A chemical substance that kills insects.
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Related formsin•sec′ti•cidal (-sīdl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

insecticide in Science

insecticide

[ĭn-sĕktĭ-sīd′]
  1. A pesticide used to kill insects. Chlordane and DDT are insecticides. Compare fungicide herbicide rodenticide.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.