The crossword solution for the term MEAL SOURCE is OAT, which stands for Old-fashioned, Aunt Jemima's, and Thick-cut. Old-fashioned oats are a type of OAT that is steamed and flattened, making them a popular choice for breakfast cereals and porridge. Aunt Jemima's is a brand of pancake mix and syrup that has been around since 1889. Thick-cut oats are a type of OAT that is cut thicker than regular oats, making them ideal for baking and cooking. All three of these types of oats can be used as a meal source, providing a nutritious and delicious option for breakfast, lunch, or dinner.