derailleur

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noun de·rail·leur \di-ˈrā-lər\

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

Recent Examples of derailleur from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'derailleur'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of derailleur

French dérailleur, from dérailler


First Known Use: 1930


DERAILLEUR Defined for English Language Learners

derailleur

play
noun

Definition of derailleur for English Language Learners

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

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