flavin(redirected from flavin adenine dinucleotide (FAD))
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, any one of a group of relatively small organic molecules required for the catalytic function of certain enzymes. A coenzyme may either be attached by covalent bonds to a particular enzyme or exist freely in solution, but in either case it participates intimately in
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any one of a group of natural organic compounds present in all living cells; a derivative of the heterocyclic compounds of isoalloxazine (C10H6O2N4). Many flavins are important biologically active substances, for example, the vitamin riboflavin. Riboflavin’s derivatives flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN) are widely distributed coenzymes, which take part in the oxidation-reduction processes of organisms.