This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A series of spans or arches used to carry a road or railroad over a wide valley or over other roads or railroads.

n. A bridge with several spans that carries road or rail traffic over a valley or other obstacles.

n. 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. Cf. trestlework.

n. An extensive bridge, consisting strictly of a series of arches of masonry, erected for the purpose of conducting a road or a railway over a valley or a district of low level, or over existing channels of communication, where an embankment would be impracticable or inexpedient; more widely, any elevated roadway for which artificial constructions of timber, iron, bricks, or stonework are established. Compare aqueduct.

n. bridge consisting of a series of arches supported by piers used to carry a road (or railroad) over a valley

"A deep bore tunnel replacement for the viaduct is the only solution that gives us both."

bridge    span   

aqueduct   

trestlework   

bridge    trestlework    trestle   

aqueduct    épergne    qanat    embankment    underpass    on-ramp    flume    nationalisation    carpool    trestle