noun. any of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respiration.
1. Noun, singular or mass Coenzyme Q10, often written with the 10 as a subscript, is also known as ubiquinone. 2. Adjective Coenzyme Q10, also known as ubiquinol and ubiquinone, plays an important role in cell energy production. 3. Adverb The body changes ubiquinone to the antioxidant form, ubiquinol, which then enters the blood inside lipoproteins and moves to various tissues.