African nation, named for the river that runs through it, which is from a Bantu word meaning "mountains" (i.e., the river that flows from the mountains). As an adjective, Congoese is native English (1797) but has been supplanted by Congolese (1900), from French Congolais.

Others are reading

Definitions of Congo from WordNet
congo (n.)
black tea grown in China;
Synonyms: congou / congou tea / English breakfast tea
Congo (n.)
a republic in central Africa; achieved independence from Belgium in 1960;
Synonyms: Democratic Republic of the Congo / Zaire / Belgian Congo
Congo (n.)
a major African river (one of the world's longest); flows through Congo into the South Atlantic;
Synonyms: Congo River / Zaire River
Congo (n.)
a republic in west-central Africa; achieved independence from France in 1960;
Synonyms: Republic of the Congo / French Congo