1) Biochemistry journal 
phytochemical. The study of substances found in plants. 'Phytochemicals' are materials extracted from plant tissue. 
Phytochemistry is in the strict sense of the word the study of phytochemicals. These are chemicals derived from plants. In a narrower sense the terms are often used to describe the large number of secondary metabolic compounds found in plants. Many of these are known to provide protection against insect attacks and plant diseases. They also exhibi...[journal] Phytochemistry is a peer-reviewed scientific journal covering pure and applied plant chemistry, plant biochemistry and molecular biology. It is published by Elsevier and is an official publication for the Phytochemical Society of Europe and the Phytochemical Society of North America. == Abstracting and indexing == Phytochemistry i...
• (n.) Chemistry in its relation to vegetable bodies; vegetable chemistry.
(from the article `botany`) Phytochemistry, or the chemistry of plants, one of the early subdivisions of organic chemistry, has been of great importance in the identification of ...
Phy'to·chem'is·try noun [ Phyto- + chemistry .] Chemistry in its relation to vegetable bodies; vegetable chemistry. R. Hunt. 
Type: Term Pronunciation: fī′tō-kem′is-trē Definitions: 1. The biochemical study of plants; concerned with the identification, biosynthesis, and metabolism of chemical constituents of plants; especially used in regard to natural products.
phytochemistry, phytochemical 1. The chemistry of plants, plant processes, and plant products.2. The chemistry of plants and their metabolic processes.