quinone qui·none (kwĭ-nōn', kwĭn'ōn')n. Any of a class of aromatic compounds found widely in plants, especially the crystalline form used in making dyes.
Any of a class of organic compounds that occur naturally as pigments in bacteria, plants, and certain fungi. Quinones have two carbonyl groups (CO) in an unsaturated six-member carbon ring.
A yellow crystalline compound belonging to this class, used in photography, to make dyes and to tan hides. Chemical formula: C6H4O2.