permethrin
noun
per·meth·rin
(ˌ)pər-ˈme-thrən 
: a synthetic pyrethroid C21H20Cl2O3 used especially as an insecticide
Examples of permethrin in a Sentence
Recent Examples on the Web
Use an insect repellent (DEET and permethrin) and check for attached ticks after time outdoors, the CDC says.
—
Bay Area News Group, Mercury News, 22 Aug. 2025
Look for clothing and gear treated with permethrin, an insecticide.
—Kristen Jordan Shamus, Freep.com, 19 Aug. 2025
Those who are spending prolonged time outdoors should consider treating their clothing with permethrin, which helps to repel insects.
—Melissa Rudy, FOXNews.com, 15 Aug. 2025
Clothing that has been treated with permethrin also provides some protection, says Gray.
—Arricca Elin Sansone, Southern Living, 15 July 2025
See All Example Sentences for permethrin
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Bay Area News Group, Mercury News, 22 Aug. 2025
Look for clothing and gear treated with permethrin, an insecticide.
—Kristen Jordan Shamus, Freep.com, 19 Aug. 2025
Those who are spending prolonged time outdoors should consider treating their clothing with permethrin, which helps to repel insects.
—Melissa Rudy, FOXNews.com, 15 Aug. 2025
Clothing that has been treated with permethrin also provides some protection, says Gray.
—Arricca Elin Sansone, Southern Living, 15 July 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 9 Sep. 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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