quinone

noun

1. any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes

   noun.substance

   Synonyms benzoquinone

   Source: WordNet 3.0

2. A crystalline substance, C₆H₄O₂ (called also <i>benzoketone</i>), first obtained by the oxidation of quinic acid and regarded as a double ketone; also, by extension, any one of the series of which quinone proper is the type.

   noun

   Source: webster1913