NAD

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}]

from 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]

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

NAD
       Network Access Device

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