Merriam-Webster Collegiate Dictionary - ulster

 geographical name  1. region N Ireland (island) comprising Northern Ireland & N Ireland (republic); ancient kingdom, later a province comprising nine counties, three of which in 1921 joined Irish Free State (now Ireland) while the rest remained with United Kingdom  2. province N Ireland (republic) comprising counties Cavan, Donegal, & Monaghan area 3093 square miles (8042 square kilometers), population 232,206  3. Northern Ireland — used unofficially  • ~ite noun  • ~man noun ULSTER  noun  Etymology: Ulster, Ireland  Date: 1876 a long loose overcoat of Irish origin made of heavy material (as frieze)