Derailleur

Pronunciation

• UK IPA: /dɪˈɹeɪljÉ™/
• US IPA: /dəˈɹeɪlÉš/, /dəˈɹeɪljÉ™/

Origin

From French dérailleur.

Full definition of derailleur

Noun

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.