Tyrone UK /taɪˈɹəʊn/US /taɪˈɹoʊn/ noun1 •A county of Northern Ireland, Ireland island, United Kingdom; One of the six traditional counties in Northern Ireland, often known as County Tyrone.The overkingdom of Airgialla comprising Armagh, Monaghan, parts of Louth, Fermanagh, and Tyrone, had ceased to be when the Book of Rights was compiled. — 1922