viaducts Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a road or passageway built on a series of short spans or arches over a valley or lower routes Example Sentence They need to build viaducts to improve traffic. Synonyms bridge; overpass; ramp Antonyms driveway Hear It! Say It! Write It! viaducts Switch to cursive Start Share with your friends: