noun Etymology: French dérailleur, from dérailler Date: 1930 a mechanism for shifting gears on a bicycle that operates by moving the chain from one set of exposed gears to another
DERAILLEUR
Meaning of DERAILLEUR in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012