Nicotinamide adenine dinucleotide

Nicotinamide adenine dinucleotide (NAD+ or in older notation DPN+) is an important coenzyme found in cells. It plays key roles as a carrier of electrons and a participant in metabolic redox reactions, as well as in cell signaling. There are two forms of this coenzyme in cells, NAD+ and the phosphorylated form NADP⁺. These two related coenzymes have similar chemistry, but perform different roles in metabolism. When both coenzymes are being discussed, they are referred to collectively as NAD(P)+.
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Nicotinamide adenine dinucleotide n. NAD nicotinamide adenine dinucleotide, n See NADH. [more]Nicotinamide adenine dinucleotide - Community and Resources

Noun
1. a coenzyme present in most living cells and derived from the B vitamin nicotinic acid; serves as a reductant in various metabolic processes
(synonym) NAD
(hypernym) coenzyme