# nu

> English word · Noun · IPA /njuː/ · frequency rank #13,967

## Definitions
1. The letter of the Greek alphabet Ν (N) and ν (n).
2. A measure of constringence in lenses or prisms.

## Etymology
From Ancient Greek νῦ (nû), name for the letter of the Greek alphabet Ν (N) and ν (n).

## Easily confused with
- **NZ** (https://plainspell.com/en/vs/nu-vs-nz)
- **NYC** (https://plainspell.com/en/vs/nu-vs-nyc)
- **nut** (https://plainspell.com/en/vs/nu-vs-nut)
- **nun** (https://plainspell.com/en/vs/nu-vs-nun)
- **nye** (https://plainspell.com/en/vs/nu-vs-nye)
- **NYT** (https://plainspell.com/en/vs/nu-vs-nyt)
- **NYU** (https://plainspell.com/en/vs/nu-vs-nyu)
- **nuh** (https://plainspell.com/en/vs/nu-vs-nuh)
- **Nur** (https://plainspell.com/en/vs/nu-vs-nur)
- **NWA** (https://plainspell.com/en/vs/nu-vs-nwa)
- **Nyx** (https://plainspell.com/en/vs/nu-vs-nyx)
- **NWS** (https://plainspell.com/en/vs/nu-vs-nws)
- **NWO** (https://plainspell.com/en/vs/nu-vs-nwo)
- **nya** (https://plainspell.com/en/vs/nu-vs-nya)
- **nuts** (https://plainspell.com/en/vs/nu-vs-nuts)
- **nude** (https://plainspell.com/en/vs/nu-vs-nude)
- **null** (https://plainspell.com/en/vs/nu-vs-null)
- **numb** (https://plainspell.com/en/vs/nu-vs-numb)
- **nuns** (https://plainspell.com/en/vs/nu-vs-nuns)
- **nuke** (https://plainspell.com/en/vs/nu-vs-nuke)

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/nu