Definition of Ulster
a former province of Ireland, in the north of the island. The nine counties of Ulster are now divided between Northern Ireland (Antrim, Down, Armagh, Londonderry, Tyrone, and Fermanagh) and the Republic of Ireland (Cavan, Donegal, and Monaghan). (in general use) Northern Ireland.
Derivatives
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noun (plural Ulstermen)-
Pronunciation:
/-ˌwo͝omən/
noun (plural Ulsterwomen)