• synonyms




nicotinamide adenine dinucleotide: a coenzyme, C21H27N7O14P2, involved in many cellular oxidation-reduction reactions.

Definition for nad (2 of 2)


National Academy of Design. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for nad

  • Then he bade them 'Good-bye,' and went home nad dined on a good fat veal roast.

    The Pink Fairy Book|Various
  • Cymerwyd gofal mawr yn narlleniad y tafleni, fel yr hyderir nad oes ynddo un gwall gwerth ei nodi.

    A Pocket Dictionary|William Richards
  • Ir wyfi yn meddwl nad oes neb a ryfygei gymmeryd y fath orchest arno.

  • (Wilfrid nad Cynthia are practically alone) Page 685: tradional changed to traditional.

British Dictionary definitions for nad



biochem nicotinamide adenine dinucleotide; a coenzyme that is a hydrogen carrier in metabolic reactions, esp in tissue respirationFormer name: DPN
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for nad



also nads, 1980s, student slang shortening of gonad.

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for nad


[ ĕn′ā-dē ]

Short for nicotinamide adenine dinucleotide. A coenzyme that occurs in many living cells and functions as an electron acceptor. NAD is used alternately with NADH as an oxidizing or reducing agent in metabolic reactions. Chemical formula: C21H27N7O14P2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.