Goi·del·ic 
(goi-dĕlĭk)
(goi-dĕlĭk)n.
A subdivision of the Insular Celtic languages that includes Irish Gaelic, Scottish Gaelic, and Manx.
adj.
1. Of or relating to the Gaels.
2. Of or relating to Goidelic.
[From Old Irish Goídil, Gael, possibly from Old Welsh -guoidel, Gwyddel.]