The Collaborative International Dictionary of English v.0.48:
irridenta \irridenta\, irridentism \irridentism\, irridentist \irridentist\n. See irredenta, irredentism, irredentist. [PJC]WordNet (r) 3.0 (2006):
irridenta n 1: a region that is related ethnically or historically to one country but is controlled politically by another [syn: irredenta, irridenta]