rouleur

Borrowed from French rouleur (“one who causes something to roll, roller; something which rolls; cyclist who performs well on flat and undulating roads, rouleur”), from rouler (“to roll”) + -eur (suffix forming masculine nouns from verbs). Rouler is derived from Old French ruele, roele (“small wheel”) (from Medieval Latin rotulō, from Latin rotula (“small wheel; a roll”), from rota (“wheel”) (ultimately from Proto-Indo-European *Hreth₂- (“to run”)) + -ula (feminine singular of -ulus (diminutive suffix))) + -er (suffix forming infinitives of first-conjugation verbs).

来源：wiktionary