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Define the word Nad

"Nad" gcide "The Collaborative International Dictionary of English v.0.48"

Nad \Nad\ (n[a^]d), Nadde \Nad"de\ (n[a^]d"de). [Contr. fr. ne
   hadde.]
   Had not. [Obs.] --Chaucer.
   [1913 Webster]

"NAD" wn "WordNet (r) 2.0"

NAD
     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: nicotinamide adenine dinucleotide]

"nad" vera "Virtual Entity of Relevant Acronyms (Version 1.9, June 2002)"

NAD
     Network Access Device