Derailleur gears operates the lever while pedalling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets. For more information about the choice of particular gear ratios and sprocket sizes, see Bicycle gearing. "Derailleur" is a French word, spelled "dérailleur" in French, derived from the derailment of a train from its tracks. Its first recorded use was 1930. At least one notable bicycle industry author has attempted to promote the anglicized spelling of "derailer". As of 2013, however, neither Merriam-Webster nor the Oxford English Dictionary has an entry for "derailer". Various derailleur systems were
Longest word in English likely to be encountered in general text are "deinstitutionalization" and "counterrevolutionaries", with 22 letters each. A computer study of over a million samples of normal English prose found that the longest word one is likely to encounter on an everyday basis is "uncharacteristically", at 20 letters. The word "internationalization" is abbreviated "i18n", the embedded number representing the number of letters between the first and the last. In his play "Assemblywomen" ("Ecclesiazousae"), the ancient Greek comedic playwright Aristophanes created a word of 171 letters (183 in the transliteration below), which describes a dish by stringing together its ingredients: Henry Carey's farce