Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

permethrin

play
noun per·meth·rin \(ˌ)pər-ˈme-thrən\

Definition of permethrin

  1. :  a synthetic pyrethroid C21H20Cl2O3 used especially as an insecticide



Origin of permethrin

per- + methyl + pyrethrin


First Known Use: 1976


Medical Dictionary

permethrin

play
noun per·meth·rin \pər-ˈmeth-rən\

Medical Definition of permethrin

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




Learn More about permethrin


Seen and Heard

What made you want to look up permethrin? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a division or portion of a pool or whole

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1926873504

Which of the following best describes an easily irritated person?

gregarious tetchy flashy superficial
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ