The Collaborative International Dictionary
Gadhelic
Gadhelic \Ga*dhel"ic\ (g[.a]*d[e^]l"[i^]k; g[a^]d"el*[i^]k), a. Of, belonging to, or designating, that division of the Celtic languages which includes the Irish, Gaelic, and Manx.
Douglas Harper's Etymology Dictionary
Gadhelic
1796, originally "Irish," now "pertaining to the Gaels" in the broadest sense; a "discriminated form" [Century Dictionary] of Gaelic.
Wiktionary
gadhelic
a. Concerning the division of languages that includes Irish, Gaelic, and Manx