Chlorogenic is an adjective that describes something related to chlorophyll or containing chlorophyll. Chlorophyll is a green pigment found in plants, algae and cyanobacteria, which helps them absorb sunlight for photosynthesis. The word "chlorogenic" comes from the Greek words "chloros," meaning green, and "genesis," meaning birth or creation. Therefore, chlorogenic refers to something that is related to the production of chlorophyll in plants.