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Definition of derailleur noun from the Oxford Advanced Learner's Dictionary

derailleur

noun
 
/dɪˈreɪljə(r)/
 
/dɪˈreɪlər/
(specialist)
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  1. a type of gear on a bicycle that works by lifting the chain from one gearwheel to another larger or smaller one
    Word Origin1930s: from French, from dérailler ‘derail’.
See derailleur in the Oxford Advanced American Dictionary
Check pronunciation: derailleur

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