Grain-storage buildings, commonly known as silos (5 letters), are structures used to store grain and other materials. They are typically cylindrical in shape and made of concrete or metal. Silos are often used on farms to store grain for animal feed, but they can also be used to store other materials such as coal, cement, wood chips, and sawdust. Silos are designed to keep the stored material dry and safe from pests and other contaminants.