pirarucu
noun
pi·ra·ru·cu
pi-ˌrär-ə-ˈkü
: a large-scaled, predatory, freshwater fish (Arapaima gigas of the family Osteoglossidae) of the rivers of northern South America that is an esteemed food fish, has a toothed tongue, and may reach a length of nearly 10 feet (3 meters) and a weight of over 300 pounds (136 kilograms) but is typically smaller
Note: The pirarucu has been placed especially formerly in the same family (Osteoglossidae) as the arowanas.
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Merriam-Webster unabridged
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