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

Origin and Etymology of derailleur

French dérailleur, from dérailler


First Known Use: 1930


DERAILLEUR Defined for English Language Learners

derailleur

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noun de·rail·leur \di-ˈrā-lər\

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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