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English definition of “pesticide”

pesticide

noun [C or U] uk   /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.
(Definition of pesticide from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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