nbenzoquinoneany of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes
Century Dictionary and Cyclopedia
nbenzoquinoneSame as quinone.
Chambers's Twentieth Century Dictionary
nBenzoquinonea golden-yellow crystalline compound usually prepared by oxidising aniline with potassium bichromate and sulphuric acid: a general name applied to all benzene derivatives in which two oxygen atoms replace two hydrogen atoms
Thus there is quinone itself, or benzoquinone, which is benzene with two atoms of oxygen replacing two atoms of hydrogen.