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

So how does permethrin actually stack up against traditional aerosol sprays, essential oils, and lotions? —Yelena Moroz Alpert, Architectural Digest, 12 July 2024

However, permethrin products are not to be applied directly on your skin, according to the CDC. —Caroline C. Boyle, USA TODAY, 7 July 2024

Also, research shows that lice have built up resistance to many popular over-the-counter lice products that contain permethrin and pyrethrin, which are insecticides. —Lindsey Bever, Washington Post, 28 June 2024

Before going outdoors, apply DEET insect repellent or permethrin, a mild insecticide that can be bought as a spray. —Eleanor Nash, Kansas City Star, 26 June 2024

Word History

Etymology

per- + methyl + pyrethrin

First Known Use

1975, in the meaning defined above

Medical Definition

permethrin

noun

per·​meth·​rin pər-ˈmeth-rən 

: a synthetic pyrethroid pesticide C₂₁H₂₀Cl₂O₃ used especially against insects, ticks, and mites