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Gaelic (adj.)

1774, "of or pertaining to the Gaels" (meaning originally in English the Scottish Highlanders); 1775 as a noun, "language of the Celts of the Scottish Highlands;" earlier Gathelik (1590s), from Gael (Scottish Gaidheal; see Gael) + -ic.

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Definitions of Gaelic from WordNet
1
Gaelic (n.)
any of several related languages of the Celts in Ireland and Scotland;
Synonyms: Goidelic / Erse
2
Gaelic (adj.)
relating to or characteristic of the Celts;
Synonyms: Celtic
From wordnet.princeton.edu