Source : Webster's Revised Unabridged Dictionary (1913)

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}.]