bifenthrin

noun

bi·​fen·​thrin bī-ˈfen-thrən 

: a synthetic, broad-spectrum, pyrethroid insecticide and acaricide C₂₃H₂₂ClF₃O₂

Plant nurseries in certain counties are being required by the state to treat their soil with bifenthrin to check the spread of the ant.

—Pamela S. Zurer, Chemical & Engineering News, 2 Sept. 2002

… the most toxic compound in the creeks is bifenthrin, which is sprayed around houses by exterminators and is found in some consumer products that are spread on lawns.

—Marla Cone, Los Angeles Times, 14 July 2006

Word History

First Known Use

1987, in the meaning defined above

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!