vi ‧ a ‧ duct /ˈvaɪədʌkt/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Latin ; Origin: via 'way, road' + English -duct (as in aqueduct ) ]
a long high bridge, especially one with ↑ arch es , that crosses a valley and has a road or railway on it