(from the article `architecture, Western`) ...macellum, which was not essentially an open square but a market building consisting of shops around a colonnaded court. Great warehouses, called ... Found on http://www.britannica.com/eb/a-z/h/71
A large warehouse used for the storage of food and grain. The staple diet of the Roman army was corn, and great care was taken to ensure that the grain supply was secure - soldiers tended to mutiny if they were not fed. The graneries in an auxiliary fort were generally placed in the latera praetoria beside the principia, though in the legionary for…... Found on http://www.encyclo.co.uk/visitor-contributions.php