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ataxia

(Encyclopedia)ataxia ətăkˈsēə [key], lack of coordination of the voluntary muscles resulting in irregular movements of the body. Ataxia can be brought on by an injury, infection, or degenerative disease of the...

Atbarah

(Encyclopedia)Atbarah or Atbara both: ătbäˈrə [key], town, E Sudan, at the junction of the Atbara and Nile rivers. An important rail junction, it is also the headquarters of Sudan's...

Mackenzie, Sir William

(Encyclopedia)Mackenzie, Sir William, 1849–1923, Canadian railroad builder and financier, b. Ontario. In the early 1870s he became a railroad contractor. He constructed portions of the Canadian National and the C...

scheelite

(Encyclopedia)scheelite shāˈlīt, shēˈ– [key], heavy white or yellow mineral, calcium tungstate, CaWO4, crystallizing in the tetragonal system. It is found in granite pegmatites, in contact-metamorphic deposi...

Alay

(Encyclopedia)Alay or Alai both: älīˈ [key], mountain range, SW Kyrgyzstan. A western branch of the Tian Shan system, it extends c.200 mi (320 km) W from the Chinese border and rises to c.19,280 ft (5,880 m) in ...

Clinch

(Encyclopedia)Clinch, river, c.300 mi (480 km) long, formed by the junction of two forks in SW Va., and flowing generally SW across E Tenn. to the Tennessee River at Kingston. Its waters and those of its tributary,...

Fish, Stuyvesant

(Encyclopedia)Fish, Stuyvesant stīˈvəsənt [key], 1851–1923, American railroad executive, b. New York City; son of Hamilton Fish (1808–93). He became (1877) a director of the Illinois Central RR, and as its ...

equator

(Encyclopedia)equator, imaginary great circle around the earth, everywhere equidistant from the two geographical poles and forming the base line from which latitude is reckoned. The equator, which measures c.24,902...

pyrolusite

(Encyclopedia)pyrolusite pīˈrōlo͞ozīt [key], naturally occurring manganese dioxide, MnO2, a black mineral that crystallizes in the tetragonal system but is usually found in earthy or massive deposits. It is th...

pyrrhotite

(Encyclopedia)pyrrhotite pĭrˈətīt [key] or magnetic pyrites, bronze-yellow to bronze-red mineral, a sulfide of iron sometimes containing nickel. It tarnishes easily and is somewhat magnetic. It crystallizes in ...