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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]