Any eukaryotic metabolite produced during a metabolic reaction in plants, the kingdom that include flowering plants, conifers and other gymnosperms.
A semiochemical used in olfactory communication between organisms of the same species eliciting a change in sexual or social behaviour.
A chemical that attracts insects.
The role played by a substance in enhancing the appearance or odour of the human body; a name given to the substance itself or to a component of it.
Strictly, a substance intended to kill pests. In common usage, any substance used for controlling, preventing, or destroying animal, microbiological or plant pests.