noun bi·fen·thrin \bī-ˈfen-thrən\

Definition of bifenthrin

  1. :  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

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