/ ˈfiːniən; NAmE / noun
1.
a member of an organization formed in the 1850s in the US and Ireland in order to end British rule in Ireland
2.
( informal , taboo ) (especially in Northern Ireland) an offensive word for a Catholic
For more information see the Cultural Guide
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WORD ORIGIN
from Old Irish féne , the name of an ancient Irish people, confused with fíann , fianna (see Fianna Fáil ).