Irish Syllabification: (I·rish)Pronunciation: /ˈīriSH/Translate Irish | into French | into German | into Italian | into Spanish Definition of Irish adjective of or relating to Ireland, its people, or the Goidelic language traditionally and historically spoken there. noun 1 (also Irish Gaelic) the Goidelic language that is the first official language of the Republic of Ireland. 2 (as plural noun the Irish) the people of Ireland; Irish people collectively. Phrases get one's Irish up cause one to become angry:if someone tries to make me do something I don’t want to do, it gets my Irish upDerivatives Irishness noun Origin: Middle English: from Old English Īr- (stem of Īras 'the Irish' and Īrland 'Ireland', obscurely related to Hibernian) + -ish1Irish in other Oxford dictionaries Definition of Irish in the British & World English dictionary