derailleur

noun de·rail·leur \ di-ˈrā-lər \

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

Recent Examples of derailleur from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'derailleur.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of derailleur

French dérailleur, from dérailler


DERAILLEUR Defined for English Language Learners

derailleur

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


Learn More about derailleur


Seen and Heard

What made you want to look up derailleur? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

one who attends or assists a leader

Get Word of the Day daily email!

Test Your Vocabulary

Test Your Emoji Exceptionalism

  • test-your-emoji-exceptionalism-written-with-a-lot-of-emoji
  • What is this emoji intended to represent: 🤳
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!