arapaima

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ar·a·pai·ma

 (ăr′ə-pī′mə)
n.
A large South American freshwater food fish (Arapaima gigas) that can attain a length of up to 3 meters (10 feet). Also called pirarucu.

[American Spanish or Portuguese, both probably of Tupian origin.]
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.

arapaima

(ˌærəˈpaɪmə)
n
(Animals) a very large primitive freshwater teleost fish, Arapaima gigas, that occurs in tropical South America and can attain a length of 4.5 m (15 ft) and a weight of 200 kg (440 lbs): family Osteoglossidae
[via Portuguese from Tupi]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Translations
Arapaima