ubiquinonePronunciation: /juːˈbɪkwɪnəʊn/Definition of ubiquinone noun Biochemistry any of a class of compounds which occur in all living cells and which 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 US English dictionary
