GuadalquivirPronunciation: /ˌgwɑːdəlkɪˈvɪə, gwaðalkiˈβir/Definition of Guadalquivir a river of Andalusia in southern Spain. It flows for 657 km (410 miles) through Cordoba and Seville to reach the Atlantic north-west of Cadiz. Guadalquivir in other Oxford dictionaries Definition of Guadalquivir in the US English dictionary