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
Treat clothing and other gear with products that contain permethrin to repel ticks.
—
Don Sweeney, Sacbee.com, 5 May 2026
Treating clothing with permethrin may be especially beneficial, since the substance withstands several washes.
—Lakshmi Chauhan, The Conversation, 30 Apr. 2026
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
See All Example Sentences for permethrin
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Don Sweeney, Sacbee.com, 5 May 2026
Treating clothing with permethrin may be especially beneficial, since the substance withstands several washes.
—Lakshmi Chauhan, The Conversation, 30 Apr. 2026
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
See All Example Sentences for permethrin
Cite this Entry
“Permethrin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/permethrin. Accessed 17 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
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