n. & adj.
--n. hist. a member of a 19th-c. league among the Irish in the US & Ireland for promoting revolution and overthrowing British government in Ireland.
--adj. of or relating to the Fenians.
Derivatives:
Fenianism n.
Etymology: OIr. f{eacute}ne name of an ancient Irish people, confused with f{iacute}ann guard of legendary kings