noun. a chemical substance obtained from plants that is biologically active but not nutritive.
1. Adjective The good news is that fruit/vegetable peels and skins contain some healthy plant phytochemical and fiber, but the bad news is that they can also bring contaminants to our table. 2. Noun, singular or mass It was originally thought that the caffeine content was responsible, but further exploration revealed it to be the work of a particular phytochemical.