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.

Definition of Rio Negro in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict