A vaulted room, sometimes below ground as a basement, but always with a floor above. Usually used for storage in buildings. While some were used as simple storerooms, others were rented out as shops. The term is sometimes used to describe a crypt beneath a church used for burial purposes.
False colour 3D laser scan image of 12th century undercroft under 50-56 Howard St, Great Yarmouth. (© NCC)