quinone

qui·none

noun \kwi-ˈnōn, ˈkwi-ˌ\

Definition of QUINONE

1

: either of two isomeric cyclic crystalline compounds C₆H₄O₂ that are derivatives of benzene

2

: any of various usually yellow, orange, or red quinonoid compounds including several that are biologically important as coenzymes, hydrogen acceptors, or vitamins

Origin of QUINONE

International Scientific Vocabulary quinine + -one

First Known Use: 1853

qui·none

noun \kwin-ˈōn, ˈkwin-ˌ\   (Medical Dictionary)

Medical Definition of QUINONE

1

: either of two isomeric cyclic crystalline compounds C₆H₄O₂ that are extremely irritating to the skin and mucous membranes

2

: any of various usually yellow, orange, or red quinonoid compounds including several that are biologically important as coenzymes, hydrogen acceptors, or vitamins

quinone

noun    (Concise Encyclopedia)

Any member of a class of cyclic organic compounds comprising a six-membered unsaturated ring (see saturation) to which two oxygen atoms are bonded as carbonyl groups (CO; see functional 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 (see vitamin 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.