Viaduct
Viaduct , noun
[Latin via a way + -duct, as in aqueduct: compare French viaduc. See Via, and Aqueduct.]
A structure of considerable magnitude, usually with arches or supported on trestles, for carrying a road, as a railroad, high above the ground or water; a bridge; especially, one for crossing a valley or a gorge. Compare Trestlework.