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English definition of “pesticide”

pesticide

noun [C or U]     /ˈpes.tɪ.saɪd/ US  /-t̬ə-/
a chemical substance used to kill harmful insects, small animals, wild plants, and other unwanted organisms: The pesticides that farmers spray on their crops kill pests but they can also damage people's health. → Compare herbicide, insecticidePlant pathologyImproving fertility and pest control
(Definition of pesticide noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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