quinone(n = noun.substance) benzoquinone - any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes;
A crystalline substance, C6H4O2 (called also benzoketone), 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. [1913 Webster]
quinone, n. Chem.
1 a yellow crystalline derivative of benzene with the hydrogen atoms on opposite carbon atoms replaced by two of oxygen.
2 any in a class of similar compounds.