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
Larkin now uses clothing treated with permethrin to keep ticks away while working outdoors.
—
Jennifer McLogan, CBS News, 26 May 2026
In liquid form, permethrin needs to be treated with caution and can be toxic to cats and aquatic life, Haines said.
—Gavin Escott, USA Today, 20 May 2026
Systemic Insecticide Insecticide sprays that contain bifenthrin, cyfluthrin, lambda cyhalothrin, malathion, permethrin, or pyrethrin will control aphids.
—Mary Marlowe Leverette, Southern Living, 20 May 2026
These products may contain bifenthrin, deltamethrin, or permethrin.
—Nafeesah Allen, Better Homes & Gardens, 19 May 2026
See All Example Sentences for permethrin
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Jennifer McLogan, CBS News, 26 May 2026
In liquid form, permethrin needs to be treated with caution and can be toxic to cats and aquatic life, Haines said.
—Gavin Escott, USA Today, 20 May 2026
Systemic Insecticide Insecticide sprays that contain bifenthrin, cyfluthrin, lambda cyhalothrin, malathion, permethrin, or pyrethrin will control aphids.
—Mary Marlowe Leverette, Southern Living, 20 May 2026
These products may contain bifenthrin, deltamethrin, or permethrin.
—Nafeesah Allen, Better Homes & Gardens, 19 May 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 28 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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