chlorpyrifos

noun

chlor·​pyr·​i·​fos klȯr-ˈpir-ə-fäs How to pronounce chlorpyrifos (audio)
-ˈpī-rə
: a toxic crystalline organophosphate pesticide C9H11Cl3NO3PS that inhibits acetylcholinesterase and is used to control insect pests and ticks

Example Sentences

Recent Examples on the Web In August, the Biden administration banned the use of chlorpyrifos, a pesticide, on food crops after research linked exposure to neurological damage in children. Zoe Christen Jones, CBS News, 7 Apr. 2022 During the Trump administration, scientists recommended restricting the use of chlorpyrifos on food and vegetable crops, but this guidance was ignored by then-EPA Administrator Scott Pruitt, who said there needed to be additional studies. Catherine Garcia, The Week, 18 Aug. 2021 Ending the use of chlorpyrifos on food will help to ensure children, farmworkers, and all people are protected from the potentially dangerous consequences of this pesticide. Catherine Garcia, The Week, 18 Aug. 2021 The agency had banned chlorpyrifos for household uses in 2000, but allowed agricultural producers to continue using it. Devan Cole, CNN, 18 Aug. 2021 The European Union, Canada and some states including California, Hawaii, New York, Maryland, and Oregon have restricted application of chlorpyrifos on foods. John Flesher, chicagotribune.com, 18 Aug. 2021 The ban would stop the use of the pesticide chlorpyrifos on all food, the agency said Wednesday. Timothy Puko, WSJ, 18 Aug. 2021 Scientific studies have shown that chlorpyrifos damages the brains of fetuses and children. Matthew Daly, ajc, 29 Apr. 2021 Environmental groups said a ban of chlorpyrifos is long overdue. Matthew Daly, ajc, 29 Apr. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'chlorpyrifos.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

Etymology

chlor- + pyridine + -fos (alteration of phosphorus)

First Known Use

1970, in the meaning defined above

Time Traveler
The first known use of chlorpyrifos was in 1970

Dictionary Entries Near chlorpyrifos

Cite this Entry

“Chlorpyrifos.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chlorpyrifos. Accessed 30 Jan. 2023.

Medical Definition

chlorpyrifos

noun
chlor·​pyr·​i·​fos -ˈpir-ə-fäs, -ˈpī-rə- How to pronounce chlorpyrifos (audio)
: a toxic crystalline organophosphate pesticide C9H11Cl3NO3PS that inhibits acetylcholinesterase and is used to control insect pests and ticks
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