chlorpyrifos

noun1

1. •
   A crystalline organophosphate insecticide that inhibits acetylcholinesterase.[diethoxy-sulfanylidene-(3,5,6-trichloropyridin-2-yl)oxy-λ5-phosphane]

   • "Chlorpyrifos is considered to be toxic to fish, crustaceans, and bees."