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• nad
  nad

  noun

  Usually nads. a testicle.
• NAD
  NAD

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

  abbreviation

  National Academy of Design.

nad

¹ American  

[nad] / næd /

noun

Slang: Vulgar.

1. Usually nads. a testicle.

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NAD ² American  

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

2. Slang. not a doctor.

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N.A.D. ³ American  

abbreviation

1. National Academy of Design.

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NAD British  

noun

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

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NAD Scientific  

/ 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 .

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Etymology

Origin of nad

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

Example Sentences

See Examples For:

nad NAD

Previous military cargo sent into Ukraine by rail through Dobra and the nearby town of Cierna nad Tisou contained mostly ammunition and basic military hardware.

From New York Times ● Apr. 14, 2022

A team representing Peter Pastorok’s funeral services from the Slovakian village of Kalna nad Hronom emerged as the winner.

From Seattle Times ● Nov. 10, 2016

Two brothers representing Peter Pastorok’s funeral services from Kalná nad Hronom emerged as the winners.

From The Guardian ● Nov. 10, 2016

Should Apple be responsible for working conditions here in Usti nad Labem?

From Forbes ● Nov. 8, 2013

Neud cur a lafur im wylofedd, Neud cerydd Dofydd, nad rhydd rhuddgledd.

From Some Specimens of the Poetry of the Ancient Welsh Bards by Evans, Evan

“T-Mobile has serious confidentiality concerns with any information that would have to be shared in an NAD proceeding initiated by AT&T,” a T-Mobile spokeswoman said.

From The Wall Street Journal ● Dec. 14, 2025

In May, NAD filed a statement about the lawsuit and their action to push for accessibility for all to public discourse.

From Salon ● Jul. 6, 2025

The results of the new study show that a substance found in pomegranates, urolithin A, removes weak mitochondria from the brain just as effectively as NAD supplement.

From Science Daily ● May 22, 2024

A second variation of NAD, NADP, contains an extra phosphate group.

From Textbooks ● Jun. 9, 2022

But no—if Thibet NAD M.P.s, They were far better bred than these, Nor gave the slightest opposition, During the Monarch's whole dentition.

From The Humorous Poetry of the English Language; from Chaucer to Saxe by Parton, James