(n) any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes, Syn.benzoquinone
(n) any of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respiration, Syn.coenzyme Q
n. [ Anthracene + quinone. ] (Chem.) A hydrocarbon, C6H4.C2O2.C6H4, subliming in shining yellow needles. It is obtained by oxidation of anthracene. [ 1913 Webster ]
n. [ Hydro-, 2 + quinone. ] (Chem.) A white crystalline substance, C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene. [ 1913 Webster ]
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 ]
n. [ Xylene + quinone. ] (Chem.) Any one of a group of quinone compounds obtained respectively by the oxidation of certain xylidine compounds. In general they are yellow crystalline substances. [ 1913 Webster ]
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