viaduct

As a noun viaduct

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

As an adjective false is

(label) one of two states of a boolean variable; logic.

As a noun viaduct

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

As an adjective undefined is

lacking a definition or value.

As nouns the difference between viaduct and flyover

is that viaduct is a bridge with several spans that carries road or rail traffic over a valley or other obstacles while flyover is a low-level flight, especially of military aircraft, of a ceremonial nature; a flypast British.

As nouns the difference between viaduct and catwalk

is that viaduct is a bridge with several spans that carries road or rail traffic over a valley or other obstacles while catwalk is an elevated enclosed passage providing access fore and aft from the bridge of a merchant vessel.

As nouns the difference between viaduct and girder

is that viaduct is a bridge with several spans that carries road or rail traffic over a valley or other obstacles while girder is a beam of steel, wood, or reinforced concrete, used as a main horizontal support in a building or structure.

As nouns the difference between aquaduct and viaduct

is that aquaduct is while viaduct is a bridge with several spans that carries road or rail traffic over a valley or other obstacles.