proper noun/da.nyb/
Danube (a river in Europe; flowing 2,850 kilometers from the confluence of the Breg and Brigach at Donaueschingen, Germany, through Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine, into the Black Sea)
Inherited from Middle French Danube, from Old French Danube (att. since mid-12th c.), borrowed from Latin Dānubius, from Proto-Celtic *Dānowyos, an extended form of the river-name *Dānu, from Proto-Indo-European *déh₂nu (“river goddess”), akin to *dʰenh₂- (“to set in motion; to flow”).