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
And always use bug spray — particularly one with DEET, permethrin or picaridin.
—
Cara Lynn Shultz, PEOPLE, 24 Apr. 2026
Clothing that has been treated with permethrin also provides some protection, says Gray.
—Arricca Elin Sansone, Southern Living, 17 Apr. 2026
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
See All Example Sentences for permethrin
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.
Cara Lynn Shultz, PEOPLE, 24 Apr. 2026
Clothing that has been treated with permethrin also provides some protection, says Gray.
—Arricca Elin Sansone, Southern Living, 17 Apr. 2026
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
See All Example Sentences for permethrin
Cite this Entry
“Permethrin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/permethrin. Accessed 2 May. 2026.
Copy CitationMedical Definition
permethrin
noun
per·meth·rin
pər-ˈmeth-rən
: a synthetic pyrethroid pesticide C21H20Cl2O3 used especially against insects, ticks, and mites
Love words? Need even more definitions?
Merriam-Webster unabridged
