A CURVED gateway is an architectural structure that is characterized by its CURVED shape. It is typically made of stone or brick and is often used as an entrance to a building or other area. The term 'CURVED gateway' can also refer to a type of ARCH, which is a structure composed of two CURVED elements that meet at the top. The word 'ARCH' is derived from the Latin word for 'CURVED, ' and is commonly used to describe this type of structure.