Added 10 October 2026 danube noun Categories: NatureRare Words noun ! Definition from WordNet 3.1, Princeton University. More about danube at Wordnik → Where our words come from → The 2nd longest European river (after the Volga); flows from southwestern Germany to the Black Sea. Vienna, Budapest, and Belgrade are on the banks of the Danube Related Words: dunatiszasavadanubianviennarioduneriverdonaudunavdanubius Back to today's word