Before revision: The word is a combination of the Latin prefix "infra" , meaning "below", as many of these constructions are underground (for example, tunnels, water and gas systems, and railways), and the French word "structure" (derived from the Latin word " structure ") .
After revision: The word is a combination of the Latin prefix infra- , meaning "below", as many of these constructions are underground (for example, tunnels, water and gas systems, and railways), and the French word structure .