from The American Heritage® Dictionary of the English Language, 4th Edition

  • A river of southeast South America rising in southern Brazil and flowing about 1,609 km (1,000 mi) west and south along the Brazil-Argentina border and the Argentina-Uruguay border to the Río de la Plata.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a South American river that arises in southern Brazil and flows south to the Rio de la Plata; the northern section forms the boundary between Argentina and Brazil and the southern section forms the boundary between Argentina and Uruguay


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