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1. A layer of deeply pigmented grey matter in the midbrain; associated with the striate body; is involved in metabolic disturbances associated with Parkinson's disease and with Huntington's disease
   - substantia nigra, locus niger

1. An African river; flows into the South Atlantic
   - Niger River
    
2. A landlocked republic in West Africa; gained independence from France in 1960; most of the country is dominated by the Sahara Desert
   - Republic of Niger

Type of: African country, African nation, neural structure, river

Part of: Africa, Benin, Dahomey, Federal Republic of Nigeria, French Guinea, French Sudan, Guinea, Mali, mesencephalon, midbrain, Nigeria, Republic of Benin, Republic of Guinea, Republic of Mali

Encyclopedia: Niger, Peter George