ubiquinone Syllabification: (u·bi·qui·none)Pronunciation: /yo͞oˈbikwəˌnōn/Definition of ubiquinone noun Biochemistry any of a class of compounds that occur in all living cells and that act as electron-transfer agents in cell respiration. They are substituted quinones. Origin: 1950s: blend of ubiquitous and quinoneubiquinone in other Oxford dictionaries Definition of ubiquinone in the British & World English dictionary
