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night blindness

(Encyclopedia)night blindness, inability to see normally in subdued light. It is usually a result of vitamin A deficiency. The rod cells, one of two light-sensitive areas of the retina of the eye, are impaired in t...

nightingale

(Encyclopedia)nightingale, common name for a migratory Old World bird of the family Turdidae (thrush family), celebrated for its vocal powers. The common nightingale of England and Western Europe, Luscinia megarhyn...

nightshade

(Encyclopedia)CE5 Nightshade, Solanum dulcamara nightshade, common name for the Solanaceae, a family of herbs, shrubs, and a few trees of warm regions, chiefly tropical America. Many are climbing or creeping ty...

nihilism

(Encyclopedia)nihilism nīˈəlĭzəm [key], theory of revolution popular among Russian extremists until the fall of the czarist government (1917); the theory was given its name by Ivan Turgenev in his novel Father...

nihonium

(Encyclopedia)nihonium nĭhōˈnēəm [key], artificially produced radioactive chemical element; symbol Nh; at. no. 113; mass number of most stable isotope 284; m.p., b.p., sp. gr., and valence unknown. Situated in...

Nijinsky, Vaslav

(Encyclopedia)Nijinsky, Vaslav vəsläfˈ nyĭzhēnˈskē [key], 1890–1950, Russian ballet dancer and choreographer; brother of Bronislava Nijinska. Nijinsky is widely considered the greatest dancer of the 20th c...

Nijmegen

(Encyclopedia)Nijmegen nīˈmāˌgən [key], city (1994 pop. 147,018), Gelderland prov., E Netherlands, on the Waal River, near the German border. It is a rail and water transportation point and an industrial cente...

Nikon

(Encyclopedia)Nikon nēˈkōn [key], 1605–81, Russian churchman, patriarch of the Russian Orthodox Church (1652–66). He undertook an extremely vigorous reform of church discipline and ritual with a view to purg...

Nikopol, town, Bulgaria

(Encyclopedia)Nikopol nēkôˈpôl [key], town (1993 pop. 4,897), N Bulgaria, a port on the Danube River bordering Romania. Farming, viticulture, and fishing are the chief occupations. Founded in 629 by Byzantine e...

Nile

(Encyclopedia)Nile, longest river in the world, c.4,160 mi (6,695 km) long from its remotest headstream, the Luvironza River in Burundi, central Africa, to its delta on the Mediterranean Sea, NE Egypt. The Nile flo...