\Vi`a*duct\, n. [L. via a way + -duct, as in aqueduct:
cf. F. viaduc. See {Via}, and {Aqueduct}.]
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}.