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Define the word nicotinamide adenine dinucleotide

"nicotinamide adenine dinucleotide" wn "WordNet (r) 2.0"

nicotinamide adenine dinucleotide
     n : a coenzyme present in most living cells and derived from the
         B vitamin nicotinic acid; serves as a reductant in
         various metabolic processes [syn: NAD]