The term 'OATEN' is a five-letter word that refers to a cereal grass. Oats are a type of cereal grain that is widely cultivated for its edible seeds, which are used to make oatmeal and other breakfast cereals. Oats are also used as animal feed and as a source of fiber in many processed foods. Oats are a popular health food due to their high levels of dietary fiber, protein, and other essential vitamins and minerals.