International Scientific Vocabulary quinine + -one
First Known Use: 1853
noun\kwin-ˈōn, ˈkwin-ˌ\(Medical Dictionary)
Medical Definition of QUINONE
: either of two isomeric cyclic crystalline compounds C6H4O2 that are extremely irritating to the skin and mucous membranes
: any of various usually yellow, orange, or red quinonoid compounds including several that are biologically important as coenzymes, hydrogen acceptors, or vitamins
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.