nad

¹

[ nad ]

noun

, Slang: Vulgar.

1. Usually nads. a testicle.

NAD

²

Biochemistry.

1. nicotinamide adenine dinucleotide: a coenzyme, C 2 1 H 2 7 N 7 O 1 4 P 2 , involved in many cellular oxidation-reduction reactions.

N.A.D.

³

abbreviation for

1. National Academy of Design.

NAD

noun

1. biochem nicotinamide adenine dinucleotide; a coenzyme that is a hydrogen carrier in metabolic reactions, esp in tissue respiration Former nameDPN

NAD

/ ĕn′ā-dē′ /

1. 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: C 21 H 27 N 7 O 14 P 2 .

Word History and Origins

Origin of nad¹

First recorded in 1960–65; shortening of gonad ( def )