From Wiktionary, the free dictionary
From rìgh (“king”) + -ail (adjectival suffix).
rìoghail
- royal, regal
- kingly
- Edward Dwelly (1911) “rìoghail”, in Faclair Gàidhlig gu Beurla le Dealbhan [The Illustrated Gaelic–English Dictionary][1], 10th edition, Edinburgh: Birlinn Limited, →ISBN