Real Dictionary

chlorophyll in American English
the green pigment found in the chloroplasts of plant cells: it occurs in five forms, esp. (chlorophyll a), C55H72MgN4O5, and (chlorophyll b), C55H70MgN4O6: it is essential to the photosynthetic process and is used as a coloring agent, in topical medicines
noun: the green coloring matter of leaves and plants, essential to the production of carbohydrates by photosynthesis, and occurring in a bluish-black form, C55H72MgN4O5 (chlorophyll a), and a dark-green form, C55H70MgN4O6 (chlorophyll b)

chlorophyll in British English
noun: the green pigment of plants and photosynthetic algae and bacteria that traps the energy of sunlight for photosynthesis and exists in several forms, the most abundant being chlorophyll a (C55 H72 O5N4Mg): used as a colouring agent in medicines or food ( E1

chlorophyll in the Pharmaceutical Industry
noun: Chlorophyll is any, or all, of a group of green pigments that are found in plants and other organisms, which enables them to use the energy from sunlight.