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chlorpyrifos

[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.
Origin
chlor-2 + pyri(dine) + -fos, for phosphorus
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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