Biochemical/ˌbaɪəʊˈkemɪkl/ Definition 1 of 2Pro Tip 1/3Living Organisms Focus Refers to chemical aspects in living things, not non-living or artificial. The biochemistry of algae is key for their growth. Pro Tip 2/3Specialized Research Used in academia or professions studying life's chemical complexity. Her PhD was on the biochemical aspects of digestion. Pro Tip 3/3Not Always Visible Biochemical elements might be microscopic or not evident to the naked eye. Biochemical signals can influence cell behavior.