Cereal seeds are a type of edible seed that is used to make breakfast cereals. OAT is a cereal seed that is commonly used in porridge and other breakfast dishes. MILLET is another cereal seed that is often used in breads and other baked goods. GRAIN is a general term for cereal seeds, such as wheat, barley, and rye. BRAN is the outer layer of cereal grains, which is high in dietary fiber. Trix is a brand of breakfast cereal made from corn, rice, and oats.