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 (pĭl′kō-mä′yō, pēl′-)
A river of central South America rising in central Bolivia and flowing about 1,610 km (1,000 mi) southeast along the Argentina-Paraguay border to the Paraguay River.
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.


(Spanish pilkoˈmajo)
(Placename) a river in S central South America, rising in W central Bolivia and flowing southeast, forming the border between Argentina and Paraguay, to the Paraguay River at Asunción. Length: about 1600 km (1000 miles)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌpil kəˈmɑ yoʊ)

a river in S central South America, flowing SE from Bolivia along the border between Paraguay and Argentina to the Paraguay River at Asunción. 1000 mi. (1610 km) long.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Daily rhythm of feeding activity of the freshwater crab Dilocarcinus pagei pagei in the Rio Pilcomayo National Park, Formosa, Argentina.
Guerreras y timidas doncellas del Pilcomayo. Una etnografia con mujeres qom (tobas) del oeste de Formosa.
Se analizaron 40 establecimientos pecuarios de los departamentos Formosa, Pilaga, Pirane, Pilcomayo y Patino de la mencionada provincia.
(2014) reported that floods in the Pilcomayo River in Bolivia almost annually contain suspended sediment concentrations over 100,000 mg/l, which results in massive fish mortalities.
They crossed the Bermejo and Pilcomayo rivers again, and came to replace the Italians and Galicians whose sons were now doctors, lecturers and designers.