derailleur


de·rail·leur

D0149300 (dĭ-rā′lər)n. A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.
[French dérailleur, from dérailler, to derail; see derail.]

derailleur

(dəˈreɪljə) n (Mechanical Engineering) a mechanism for changing gear on bicycles, consisting of a device that lifts the driving chain from one sprocket wheel to another of different size[French dérailleur derailer]

de•rail•leur

(dɪˈreɪ lər)

n. a gear-shifting mechanism on a bicycle that shifts the drive chain from one sprocket wheel to another. [1945–50; < French dérailleur literally, a device causing disengagement or derailing]
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