Any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes WordNet 3.0 & Open English WordNet

The quinones are a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds, resulting in "a fully conjugated cyclic dione structure". Wikipedia

Compounds having a fully conjugated cyclic dione structure derived from aromatic compounds by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds Wikidata

Any of a class of aromatic compounds having two carbonyl functional groups in the same six-membered ring. Wiktionary

Compound. Wiktionary (translation)