pesticide

noun

pes·​ti·​cide ˈpe-stə-ˌsīd How to pronounce pesticide (audio)
Synonyms of pesticidenext
: an agent used to destroy pests
pesticidal adjective

Examples of pesticide in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Using Pesticides in the Garden Keeping an immaculate garden usually relies on pesticides and herbicides. Lauren David, Better Homes & Gardens, 17 May 2026 Natural pesticides offering some downy mildew control include need oils and copper fungicides. Tom MacCubbin, The Orlando Sentinel, 16 May 2026 The fastest way to get rid of earwigs is to spray them with a DIY pesticide treatment, like Raid® Ant & Roach Killer. Dan Simms, USA Today, 15 May 2026 Taylor says that the process of making the tea will not remove existing chemicals from the grass blades, so this shouldn’t be done with grass that has been treated with herbicides and pesticides. Lauren Wellbank, Martha Stewart, 15 May 2026 See All Example Sentences for pesticide

Word History

First Known Use

circa 1925, in the meaning defined above

Time Traveler
The first known use of pesticide was circa 1925

Browse Nearby Words

Cite this Entry

“Pesticide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pesticide. Accessed 18 May. 2026.

Kids Definition

pesticide

noun
pes·​ti·​cide ˈpes-tə-ˌsīd How to pronounce pesticide (audio)
: a substance used to destroy pests
pesticidal
ˌpes-tə-ˈsīd-ᵊl
adjective

Medical Definition

pesticide

noun
pes·​ti·​cide ˈpes-tə-ˌsīd How to pronounce pesticide (audio)
: an agent used to destroy pests
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster