# rayleigh

> English word · Noun · frequency rank #46,133

## Definitions
1. A unit of brightness (of the sky at night) equal to 10¹⁰/4π quanta per square meter per second per steradian

## Etymology
For Lord Rayleigh, English physicist

## Easily confused with
- **Raleigh** (https://plainspell.com/en/vs/raleigh-vs-rayleigh)

## Common misspellings (12)
`aryleigh`, `ralyeigh`, `rayeligh`, `raylegih`, `rayleiggh`, `rayleighh`, `rayleihg`, `rayliegh`, `raylleigh`, `rayyleigh`, `rrayleigh`, `ryaleigh`

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