phy·to·chem·i·cal 
(fī′tō-kĕmĭ-kəl)
(fī′tō-kĕmĭ-kəl)adj.
1. Of or relating to phytochemistry.
2. Of or relating to phytochemicals.
n.
A nonnutritive bioactive plant substance, such as a flavonoid or carotenoid, considered to have a beneficial effect on human health. Also called phytonutrient.
phy′to·chemi·cal·ly adv.