a river in central and SE Europe, flowing E from southern Germany to the Black Sea. 1725 miles (2775 km) long.
German Donau.
Hungarian Duna.
Czech and Slovak Dunaj.
Romanian Dunărea.
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World English Dictionary
Danube (ˈdænjuːb)
German name: Donau, Czech name: Dunaj, Hungarian name: Duna, Croatian and Serbian name: Dunav, Romanian name: Dunărea a river in central and SE Europe, rising in the Black Forest in Germany and flowing to the Black Sea. Length: 2859 km (1776 miles)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

major river of Europe (Ger. Donau, Hungarian Duna, Rus. Dunaj), from L. Danuvius, from Celtic *danu(w)-yo-, from PIE *danu- "river" (cf. Don, Dnieper, Dniester).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

Danube River definition

River in central and southeastern Europe.

Note: Flowing for nearly two thousand miles, it is the second-longest European river, after the Volga.
Note: Composer Johann Strauss, the Younger, expressed the charm and romance of the river in his “Blue Danube Waltz.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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