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

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now