vi·a·duct 
(vīə-dŭkt′)
(vīə-dŭkt′)n.
A series of spans or arches used to carry a road or railroad over a wide valley or over other roads or railroads.
[Latin via, road; see VIA + (AQUE)DUCT.]
viaductthe Glacier Express train crossing the Landwasser viaduct in Switzerland
- irrelevancy
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