pesticide [pesticides]◼◼◼(substance used to kill or repress the activities of pests) noun [UK: ˈpe.stɪ.saɪd] [US: ˈpe.stə.ˌsaɪd]Through genetic engineering, corn can produce its own pesticides. = Grâce au génie génétique, le maïs peut produire ses propres pesticides.