DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   NAD
       n 1: a coenzyme present in most living cells and derived from
            the B vitamin nicotinic acid; serves as a reductant in
            various metabolic processes [syn: nicotinamide adenine
    dinucleotide, NAD]