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):
irridentist n 1: an advocate of irredentism [syn: irredentist, irridentist]