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derailleur

[dih-rey-ler] /dɪˈreɪ lər/
noun
1.
a gear-shifting mechanism on a bicycle that shifts the drive chain from one sprocket wheel to another.
Origin
1945-1950
1945-50; < French dérailleur literally, a device causing disengagement or derailing, equivalent to déraill(er) to derail + -eur -eur
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for derailleur

derailleur

/dəˈreɪljə/
noun
1.
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
French dérailleur derailer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for derailleur
n.

type of bicycle gear mechanism, 1930, from French dérailleur (1927), from dérailler "to go off the rails" (see derail).

Online Etymology Dictionary, © 2010 Douglas Harper
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