coenzyme

1.

(Biochem.) a molecule that is essential for the activity of some enzymes; it may exist free in solution within a living organism, but functions by binding to an enzyme to assist in catalyzing a reaction. The molecule itself may be temporarily changed during the reaction, but is ultimately restored to its original form. Many vitamins function as coenzymes.

Noun

1.

coenzyme - a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes

cocarboxylase, coenzyme A, coenzyme Q, molecule, NAD, NADP, nicotinamide adenine dinucleotide, nicotinamide adenine dinucleotide phosphate, thiamine pyrophosphate, triphosphopyridine nucleotide, ubiquinone