derailleur

noun de·rail·leur \di-ˈrā-lər\

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

Full Definition of DERAILLEUR

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

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French dérailleur, from dérailler

First Known Use: 1930

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