(noun) type genus of the Danaidae: monarch butterflies. Synonyms: Danaus, genus Danaus.
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Noun Definition 1
(noun) the 2nd longest European river (after the Volga); flows from southwestern Germany to the Black Sea. Synonyms: Danube, Danube River, Danau. Example: "Vienna, budapest, and belgrade are on the banks of the danube."