Scalloped meaning : To create or form an edge in the shape of a crescent or multiple crescents. To bake in a casserole (gratin), originally in a scallop shell; especially used in form scalloped To harvest scallops Having an edge or border marked with semicircles Cooked gratin; baked in a typical type of sauce, usually with cheese, as a casserole, e.g. scalloped potatoes; scalloped corn Baked in a scallop shell