The term STORAGE FOR FORAGE can be summarized as a SILO, which is a four-letter word. A SILO is a structure typically used to store grain or other materials such as forage for livestock. Silos are usually cylindrical in shape and made of concrete, metal, or wood. They are often used on farms to store feed for animals, and can also be used to store other materials such as coal, cement, wood chips, and sawdust.