Definition of Rio Negro in English:

Rio Negro

Syllabification: Ri·o Ne·gro
Pronunciation: /ˌrēō ˈnāɡrō/
A river in South America that rises as the Guainia in eastern Colombia and flows for about 1,400 miles (2,255 km) through northwestern Brazil before joining the Amazon River near Manaus.

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
rich in, covered with, or producing oil; oily