OstendPronunciation: /ɒˈstɛnd/Definition of Ostend a port on the North Sea coast of NW Belgium, in West Flanders; population 69,175 (2008). It is a major ferry port with links to Dover. French name Ostende /ɔstɑ̃d/. Flemish name Oostende.Ostend in other Oxford dictionaries Definition of Ostend in the US English dictionary