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Viaduct
A viaduct is a bridge composed of several small spans〔(merriam-webster )〕 for crossing a valley or a gorge.〔(The Collaborative International Dictionary of English v.0.48 )〕〔(WordNet (r) 3.0 (2006) )〕〔(oxforddictionaries )〕〔(Collins English Dictionary - Complete & Unabridged 10th Edition )〕 The term ''viaduct'' is derived from the Latin ''via'' for road and ''ducere'', to lead. The ancient Romans did not use the term; it is a modern derivation from an analogy with aqueduct.〔 Like the Roman aqueducts, many early viaducts comprised a series of arches of roughly equal length. Viaducts may span land or water or both. ==Usage== The longest viaduct in antiquity may have been the Pont Serme which crossed wide marshes in southern France.〔Colin O’Connor: Roman Bridges, Cambridge University Press 1993, ISBN 0-521-39326-4, p. 99〕 In Romance languages, the word ''viaduct'' refers to a bridge which spans only land. A bridge spanning water is called ''ponte''.
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