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From The Collaborative International Dictionary of English v.0.48:
Quinhydrone \Quin*hy"drone\, n. [Quinone + hydroquinone.] (Chem.) A green crystalline substance formed by the union of quinone with hydroquinone, or as an intermediate product in the oxidation of hydroquinone or the reduction of quinone. [Written also chinhydrone.] [1913 Webster]