The term 'Bridge Structure' can be summarized by the crossword solution of ARCH, which is a structure that spans an area and is supported at each end by a pillar or wall. An ARCH is typically used to span a river or other body of water, allowing for the passage of people and vehicles. Arches are also used in architecture, such as in doorways and windows, and in bridges. Arches are strong and durable, making them ideal for use in bridge structures.