Pronunciation: (nī'jur; Fr. nē-zher'),[key] —n. 1. a republic in NW Africa: formerly part of French West Africa. 4,239,000; 458,976 sq. mi. (1,188,748 sq. km). Cap.: Niamey.
2. a river in W Africa, rising in S Guinea, flowing NE through Mali, and then SE through Nigeria into the Gulf of Guinea. 2600 mi. (4185 km) long. See map on next page.