permethrin
noun
per·meth·rin
(ˌ)pər-ˈme-thrən 
: a synthetic pyrethroid C21H20Cl2O3 used especially as an insecticide
Examples of permethrin in a Sentence
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This includes knowing where to expect ticks, such as in wooded areas; treating clothes and gear with products containing the insecticide permethrin; and walking outside in the center of a trail as opposed to a brushy area.
—
Youri Benadjaoud, ABC News, 14 Nov. 2025
Some clothing may be pretreated with permethrin and deter mosquitoes for up to 20 washes.
—Bestreviews, Mercury News, 5 Nov. 2025
Every four weeks, the researchers re-soaked the wraps in case the permethrin wore off.
—Jonathan Lambert, NPR, 7 Oct. 2025
Look for clothing and gear treated with permethrin, an insecticide.
—Kristen Jordan Shamus, Freep.com, 19 Aug. 2025
See All Example Sentences for permethrin
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Youri Benadjaoud, ABC News, 14 Nov. 2025
Some clothing may be pretreated with permethrin and deter mosquitoes for up to 20 washes.
—Bestreviews, Mercury News, 5 Nov. 2025
Every four weeks, the researchers re-soaked the wraps in case the permethrin wore off.
—Jonathan Lambert, NPR, 7 Oct. 2025
Look for clothing and gear treated with permethrin, an insecticide.
—Kristen Jordan Shamus, Freep.com, 19 Aug. 2025
See All Example Sentences for permethrin
Cite this Entry
“Permethrin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/permethrin. Accessed 18 Dec. 2025.
Copy CitationMedical Definition
permethrin
noun
per·meth·rin
pər-ˈmeth-rən
: a synthetic pyrethroid pesticide C21H20Cl2O3 used especially against insects, ticks, and mites
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