Definition of permethrin
: a synthetic pyrethroid C21H20Cl2O3 used especially as an insecticide
Recent Examples of permethrin from the Web
For deeper protection for longer periods of time, use permethrin.
The use of products that contain permethrin, which can be used to treat boots, clothing, and camping gear will remain protective through many washings.
Wear clothing treated with the insecticide permethrin.
Spinosad, BT (both organic insecticides), carbaryl or permethrin regularly applied will keep them in check.
According to the CDC, the mosquitoes carrying the disease in Puerto Rico became resistant to the first-choice pesticide permethrin and also to malathion.
The town’s permethrin insecticides turned out to be ineffective, and daily rains washed away previous efforts.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'permethrin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of permethrin
per- + methyl + pyrethrin
First Known Use: 1975See Words from the same year
Medical Definition of permethrin
: a synthetic pyrethroid pesticide C21H20Cl2O3 used especially against insects, ticks, and mites
Learn More about permethrin
Britannica.com: Encyclopedia article about permethrin
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