relating to the Goidelic group of Celtic languages, particularly Scottish Gaelic, and the speakers of these languages and their culture.
noun
(also Scottish Gaelic) [mass noun] a Celtic language spoken mainly in the highlands and islands of western Scotland. It was brought from Ireland in the 5th and 6th centuries ad and is now spoken by about 58,000 people.
(also Irish Gaelic)another term for Irish (the language).