derailleur

derailleur

[dih-rey-ler]
noun
a gear-shifting mechanism on a bicycle that shifts the drive chain from one sprocket wheel to another.

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

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World English Dictionary
derailleur (dəˈreɪljə)
 
n
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
 
[French dérailleur derailer]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

derailleur
type of bicycle gear mechanism, 1930, from Fr. dérailleur (1927), from dérailler "to go off the rails" (see derail).
Online Etymology Dictionary, © 2010 Douglas Harper
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