# derailleur

> English word · Noun · IPA /ˌdəˈɹeɪl.jə/ · frequency rank #84,159

## Definitions
1. The mechanism on a bicycle used to move the chain from one sprocket (gear) to another.
2. The entire gearset on a bicycle with such a mechanism.

## Etymology
Borrowed from French dérailleur. Doublet of derailer.

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