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From The Collaborative International Dictionary of English v.0.48:
Viaduct \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. [1913 Webster]