The Collaborative International Dictionary of English v.0.48:
Phytochemistry \Phy"to*chem"is*try\, n. [Phyto- + chemistry.] Chemistry in its relation to vegetable bodies; vegetable chemistry. --R. Hunt. [1913 Webster]WordNet (r) 3.0 (2006):
phytochemistry n 1: the branch of organic chemistry dealing with the chemistry of plants