chlorothalonil [klawr-uh-thal-uh-nil, klohr-] noun Chemistry.
- a crystalline compound, C8Cl4N2, used as a fungicide on vegetable crops, peanuts, and lawns, and as a preservative in adhesives and paints.
chlorothalonil [klawr-uh-thal-uh-nil, klohr-] noun Chemistry.