sushi Japanese specialty consisting of cooked vinegared rice, a variety of toppings (such as fish, shellfish, omelette, and vegetables) and, in some cases, seaweeds. Nare-zushi (fermented sushi) is fermented fish, the original form of sushi. Namazushi (raw sushi) is modern sushi, made with fresh and usually raw fish. Maki-zushi is rolled sushi, with a sheet of nori either on the outside or the inside. Gunkan-zushi is in the form of a little boat.