From paraná (“river”) + -ûasu (“big”).
Paranaûasu[1]
- (LGA) Amazon (a river in northern South America)
- ^ Francisco Xavier Ribeiro Sampaio (1774–1775) Diario da Viagem da Capitania do Rio Negro (in Portuguese), line LXX; republished Lisbon: Typografia da Academia, 1825, page 26: “Paranáuasú [Paranaûasu]”