Doughnut

A fried pastry that's usually round and often has a hole in the middle, usually covered with sugar or glaze.

From Dutch 'olie-koekje' (oil cake), but the 'dough' + 'nut' naming came from the fact that early versions were rolled in dough and fried. The 'nut' referred to the small size and round shape, like a nutmeat. Named for its form, not its ingredients.