Definition of Rio Negro in English:

Rio Negro

Line breaks: Rio Negro
Pronunciation: /ˌriːəʊ ˈneɪɡrəʊ
 
, ˈnɛɡ-/
A river of South America, which rises as the Guainia in eastern Colombia and flows for about 2,255 km (1,400 miles) through NW Brazil before joining the Amazon near Manaus.

Definition of Rio Negro in:

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