noun \ˌen-ˌā-ˈdē\

Definition of NAD

: a coenzyme C21H27N7O14P2 of numerous dehydrogenases that occurs in most cells and plays an important role in all phases of intermediary metabolism as an oxidizing agent or when in the reduced form as a reducing agent for various metabolites—called also diphosphopyridine nucleotide, DPN, nicotinamide adenine dinucleotide

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