View your list of saved words. (You can log in using Facebook.)
Any member of a class of cyclic organic compounds comprising a six-membered unsaturated ring (seesaturation) to which two oxygen atoms are bonded as carbonyl groups (CO; seefunctional group). This structure plays an important role in theories of chemical structure and colour, since quinones occur as pigments in bacteria, fungi, and certain higher plants; animals containing quinones obtain them from plants they eat. The K vitamins (seevitamin K) are naphthoquinones. The term quinone often specifically denotes para-benzoquinone (CHO), a bright yellow solid with a sharp odour used in manufacturing dyes and fungicides and in photography.
This entry comes from Encyclopædia Britannica Concise. For the full entry on quinone, visit Britannica.com.