1. a long bridge-like structure, typically a series of arches, that carries a road or railroad across a valley or other low ground

Examples

• The old stone viaduct spans the entire valley.
• Trains cross the river on a massive steel viaduct.
• The Roman viaduct still carries water to the city after 2,000 years.
• Construction of the new highway viaduct will begin next month.
• From the hilltop, we could see the railway viaduct stretching across the gorge.
• The historic viaduct is now used only by pedestrians and cyclists.