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 (dôr′o͞o, dō′ro͝o) also Due·ro (dwĕr′ō)
A river rising in north-central Spain, flowing about 800 km (495 mi) generally westward into Portugal and continuing to the Atlantic Ocean at Oporto.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈdʊərəʊ; Portuguese ˈdoru)
(Placename) a river in SW Europe, rising in N central Spain and flowing west to NE Portugal, then south as part of the border between the two countries and finally west to the Atlantic. Length: 895 km (556 miles). Spanish name: Duero
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(Port. ˈdoʊ rʊ)

a river in SW Europe, flowing W from N Spain through N Portugal to the Atlantic. ab. 475 mi. (765 km) long. Spanish, Duero.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


[ˈdʊərəʊ] NDuero m
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005