From Middle Irish ríagal, from Old Irish ríagol, ríagul (“rule; line, measure”), from Latin rēgula.
riail f (genitive singular rialach, nominative plural rialacha)
- regulation, principle
- sway, authority; order
- (ecclesiastical) code of discipline
- (law) order
- ruler; (typography) rule
- (transitive, intransitive) Alternative form of rialaigh (“rule; govern, control; regulate; govern; line”)
- "riail" in Foclóir Gaeilge-Béarla, An Gúm, 1977, by Niall Ó Dónaill.
- “ríagal” in Dictionary of the Irish Language, Royal Irish Academy, 1913–76.