Strictly, a substance intended to kill pests. In common usage, any substance used for controlling, preventing, or destroying animal, microbiological or plant pests.
organophosphorus insecticide
(CHEBI:25711)
is a
organophosphorus pesticide
(CHEBI:39093)
organophosphorus nematicide
(CHEBI:39092)
is a
organophosphorus pesticide
(CHEBI:39093)