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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

Tatar, who was born in Ilava, Slovakia, but calls Dubnica nad Vahom his hometown, also knows injured Kraken goaltender Philipp Grubauer, a native of Germany.

From Seattle Times ● Dec. 16, 2023

Kvitova underwent nearly four hours of surgery on Tuesday at a specialized clinic in Vysoke nad Jizerou.

From New York Times ● Dec. 22, 2016

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

From Forbes ● Nov. 8, 2013

He has that aerial ability that is very useful, but also the ability to make the runs behind defenders nad use the strength and power.

From The Guardian ● May 16, 2012

To brawle and broyle she nad no maner fer, To thakke his pilche stoundemel nowe and thanne Thikker thane Thome koude clowten any panne.

From Disguising at Hertford by Lydgate, John

Still, the NAD asked AT&T to pull the commercial the day after it began airing, determining that the ad ran afoul of its policy prohibiting participants from using the ad-challenge process itself for promotional purposes.

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

Nicotinamide riboside is a precursor for the essential compound NAD, which plays roles in the body related to energy generation, improved blood flow and DNA repair.

From Science Daily ● Jun. 18, 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