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derailleur

 - 2 dictionary results

de⋅rail⋅leur

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

Origin:
1945–50; < F dérailleur lit., a device causing disengagement or derailing, equiv. to déraill(er) to derail + -eur -eur
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To derailleur
de·rail·leur   (dĭ-rā'lər)   
n.  A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.

[French dérailleur, from dérailler, to derail; see derail.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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