Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

derailleur

play
noun de·rail·leur \di-ˈrā-lər\

Simple Definition of derailleur

  • : a part on a bicycle that is used to change gears by moving the chain from one gear to another one

Source: Merriam-Webster's Learner's Dictionary

Full Definition of derailleur

  1. :  a mechanism for shifting gears on a bicycle that operates by moving the chain from one set of exposed gears to another

Origin and Etymology of derailleur

French dérailleur, from dérailler


First Known Use: 1930


Seen and Heard

What made you want to look up derailleur? Please tell us where you read or heard it (including the quote, if possible).