| quinhydrone | <chemistry> 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. Alternative forms: chinhydrone. Origin: Quinone + hydroquinone. Source: Websters Dictionary (01 Mar 1998) |
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| quinhydrone electrode | One of several oxidation-reduction electrode's in which the ratio of the two forms (quinone-quinhydrone), determined by the hydrogen ion concentration, sets up a potential that can be measured and converted to a pH value (fails above pH 8). (05 Mar 2000) |