Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The mechanism on a bicycle used to move the chain from one sprocket (gear) to another.
  • n. The entire gearset on a bicycle with such a mechanism.

Etymologies

French dérailleur, from dérailler, to derail; see derail.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French dérailleur. (Wiktionary)

Examples

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