rösti Syllabification: (rösti)Pronunciation: /ˈrôstē, ˈro͝oSHtē/Definition of rösti noun (plural same) a Swiss dish of grated potatoes formed into a small flat cake and fried:place four of the rösti in the panOrigin: 1950s: from Swiss Germanrösti in other Oxford dictionaries Definition of rösti in the British & World English dictionary