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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

Several journalists from the Czech, German and French media were denied access to a news conference Orban and Babis held in the northern city of Usti nad Labem.

From Seattle Times ● Oct. 6, 2021

After a tense meeting with a worried Brezhnev in Čierna nad Tisou, near Czechoslovakia’s border with the Soviet Union, in late July, Dubček failed to warn the population that an invasion might be imminent.

From The Guardian ● Aug. 19, 2018

My guess is that the Internet stays unregulated while still mandating open and fair access to consumers nad backbone connections.

From Forbes ● Nov. 25, 2014

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

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

AT&T then sued BBB National Programs, of which NAD is a division, accusing the group of seeking to muzzle free speech.

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

It is important not to jump to conclusions about the role of NAD in the ageing process, though, as more research is required to fully understand the implications and possibilities of NAD.

From Science Daily ● Nov. 20, 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 James Parton