▪ I.† ˈroiler1Obs.—0 In 6 roylar. [f. roil v.1] One who roams idly or dissolutely. 1565Cooper Thesaurus, Circumselliones, tauerne haunters, roylars aboute. ▪ II.ˈroiler2U.S. [f. roil v.4] An apparatus, such as a revolving box, used in salting fish. 1890in Cent.Dict.