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Ozarks, the

(Encyclopedia)Ozarks, the, or Ozark Plateau, upland region, actually a dissected plateau, c.50,000 sq mi (129,500 sq km), chiefly in S Mo. and N Ark., but partly in Oklahoma and Kansas, between the Arkansas and Mis...

Symington, William Stuart

(Encyclopedia)Symington, William Stuart, 1901–88, U.S. senator (1953–76), b. Amherst, Mass. He interrupted a successful business career in 1941 to accept a War Department assignment involving a study of airplan...

Bytom

(Encyclopedia)Bytom bĭˈtôm [key], Ger. Beuthen, city (1994 est. pop. 232,400), Śląskie prov., SW Poland, in the Katowice mining region. An important heavy industrial center, it has iron- and steelworks and the...

age grade and age set

(Encyclopedia)age grade and age set, differentiation of social role based on age, commonly found in small-scale societies of North America and East Africa. Age sets are a type of sodality (nonresidential groups tha...

Cárdenas, García López de

(Encyclopedia)Cárdenas, García López de gärthēˈä lōˈpĕth dā kärˈdānäs [key], fl. 1540, Spanish explorer in the Southwest. A member of the 1540 expedition of Francisco Vásquez de Coronado, he was sel...

Maclaine, Shirley

(Encyclopedia) Maclaine, Shirley, 1934- , American actress and author, b. Richmond, Va., as Shirley MacLean Beaty. Maclaine’s father held various jobs in education...

Artevelde, Jacob van

(Encyclopedia)Artevelde, Jacob van yäˈkôp vän ärˈtəvĕldə [key], c.1290–1345, Flemish statesman, of a wealthy family of Ghent. In 1337 the Flemish cloth industry underwent a severe crisis. The pro-French ...

hemorrhage

(Encyclopedia)hemorrhage hĕmˈərĭj [key], escape of blood from the circulation (arteries, veins, capillaries) to the internal or external tissues. The term is usually applied to a loss of blood that is copious e...

Heng Samrin

(Encyclopedia)Heng Samrin hĕng sämˈrĭn [key], 1934–, Cambodian politician. He was president of Cambodia from 1979 to 1991 and headed the Communist party from 1981 to 1991. A regimental commander of the Khmer ...

free radical

(Encyclopedia)free radical, in chemistry, a molecule or atom that contains an unpaired electron but is neither positively nor negatively charged. Free radicals are usually highly reactive and unstable. They are pro...