quinone

from WordNet (r) 3.0 (2006)

quinone
    n 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 [syn: {quinone},
         {benzoquinone}]

from The Collaborative International Dictionary of English v.0.48

Quinone \Qui"none\, n. [Quinine + ketone.] (Chem.)
   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.
   [Written also {chinone}, {kinone}.]
   [1913 Webster]