['fi:n??n]
¦ noun
1. a member of the Irish Republican Brotherhood, a 19th-century revolutionary nationalist organization among the Irish in the US and Ireland.
2. informal, offensive (chiefly in Northern Ireland) a Protestant name for a Catholic.
Derivatives
Fenianism noun
Origin
from Old Ir. fene, the name of an ancient Ir. people, confused with fiann, fianna 'band of warriors', in particular the soldiers of the legendary king Finn MacCool.