ir·re·den·tist 
(ĭr′ĭ-dĕntĭst)
(ĭr′ĭ-dĕntĭst)n.
One who advocates the recovery of territory culturally or historically related to one's nation but now subject to a foreign government.
[Italian irredentista, from (Italia) irredenta, unredeemed (Italy), Italian-speaking areas subject to other countries; see IRREDENTA.]
ir′re·dentism n.
ir′re·dentist adj.