radicchio Syllabification: (ra·dic·chi·o)Pronunciation: /raˈdēkēˌō, rə-/Definition of radicchio noun (plural radicchios) chicory of a variety that has dark red leaves. Origin:ItalianSpell radicchio with a double c, then an h; it is an Italian word.radicchio in other Oxford dictionaries Definition of radicchio in the British & World English dictionary