noun
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A pesticide used to kill insects. Chlordane and DDT are insecticides.
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Compare fungicide herbicide rodenticide
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of insecticide
Explanation
Insecticide is a type of chemical used to kill insects, like those that have infested a house or a farmer's crops. Words that end in -cide usually have to do with killing, such as genocide, suicide, and patricide. Another is insecticide, which is a word for a substance that kills insects and bugs. Insecticide is a type of chemical, and it often consists of a powder or gas. If your house is full of bedbugs or cockroaches, you need insecticide. Farmers sometimes use insecticides to keep insects from destroying crops. If you're a bug, insecticide is bad news.
Vocabulary lists containing insecticide
"Dr. Seuss" by Jill Foran
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Speeches by César Chávez
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"The Exterminator" by Kirsten Weir
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Infected wounds are cleaned and debrided to remove any screwworm larvae, after which the animal is treated with an approved insecticide, DeNotta said.
From Los Angeles Times ● Jun. 6, 2026
A 2025 patent application from UCR describes the use of pinenes to improve localized insecticide injections against western drywood termites.
From Science Daily ● May 9, 2026
Unable to afford insecticide, Cuba has been plagued by mosquito-born diseases, overwhelming medical facilities.
From The Wall Street Journal ● Feb. 5, 2026
Durnell, and the issue of whether a federal insecticide rule preempts state law.
From MarketWatch ● Dec. 2, 2025
What would happen to wildlife as a result of the insecticide used against the ants was another matter.
From "Silent Spring" by Rachel Carson
Proponents say French sugar beet, apple and hazelnut farmers need the insecticides -- forbidden in France since 2018 and 2019 respectively -- to help them compete with their European counterparts.
From Barron's ● Jul. 21, 2026
Texas ranchers are using drones, increasing inspections and stepping up use of insecticides to monitor and combat the parasitic fly.
From The Wall Street Journal ● Jun. 12, 2026
To treat a screwworm infection, DeNotta said, people undergo the same combination of wound debridement and insecticides used in animals.
From Los Angeles Times ● Jun. 6, 2026
These insects can spread through complex tunnel systems, and standard contact insecticides only work if the termites physically touch the treated area.
From Science Daily ● Apr. 20, 2026
Cats are extremely sensitive to all insecticides and especially so, it seems, to dieldrin.
From "Silent Spring" by Rachel Carson
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
