‖n. [ NL., Gr. "y`dwr water + &unr_; a kidney.] (Med.) An accumulation of urine in the pelvis of the kidney, occasioned by obstruction in the urinary passages. [1913 Webster]
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 ]