chlorpyrifos

American  

[klawr-pir-uh-fos, klohr-] / klɔrˈpɪr əˌfɒs, kloʊr- /

noun

1. a broad-spectrum insecticide, C 9 H 11 Cl 3 NO 3 PS, used on lawns and ornamental plants.

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Etymology

Origin of chlorpyrifos

chlor- ² + pyri(dine) + -fos, for phosphorus

Example Sentences

Together, the results provide biological evidence supporting a connection between chlorpyrifos exposure and Parkinson's disease.

From Science Daily • Mar. 16, 2026

While some states have banned or put restrictions on the use of chlorpyrifos on golf courses, it’s still allowed in some places.

From The Wall Street Journal • Oct. 31, 2025

Children who live and go to school near farm fields where pesticides like chlorpyrifos are used show blood levels well above normal, and have higher rates of neurological problems as a result.

From Salon • Jan. 2, 2025

The saga of this pesticide, which has the unwieldy name chlorpyrifos, is a stark reminder of why so many Americans are alarmed about industrial farming and the food supply.

From New York Times • Dec. 4, 2024

Before it was banned, more than 900,000 pounds of chlorpyrifos were used in 2017— more than in any other state.

From Los Angeles Times • Sep. 30, 2024