derailleur

[ dih-rey-ler ]
/ dɪˈreɪ lər /

noun

a gear-shifting mechanism on a bicycle that shifts the drive chain from one sprocket wheel to another.

Origin of derailleur

1945–50; < French dérailleur literally, a device causing disengagement or derailing, equivalent to déraill(er) to derail + -eur -eur

Words nearby derailleur

British Dictionary definitions for derailleur

derailleur
/ (dəˈreɪljə) /

noun

a mechanism for changing gear on bicycles, consisting of a device that lifts the driving chain from one sprocket wheel to another of different size

Word Origin for derailleur

French dérailleur derailer