GaeltachtPronunciation: /ˈgeɪltəxt, ˈgeːltəxt/Definition of Gaeltacht (the Gaeltacht) a region of Ireland in which the vernacular language is Irish. Origin:Irish, earlier Gaedhealtacht, from Gaedheal 'Gael' + tacht 'talk, speech'Gaeltacht in other Oxford dictionaries Definition of Gaeltacht in the US English dictionary