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plutonium

(Encyclopedia)plutonium plo͞otōˈnēəm [key], radioactive chemical element; symbol Pu; at. no. 94; mass no. of most stable isotope 244; m.p. 641℃; b.p. 3,232℃; sp. gr. 19.84 at 20℃; valence +3, +4, +5, or ...

Salisbury, Robert Arthur Talbot Gascoyne-Cecil, 3d marquess of

(Encyclopedia)Salisbury, Robert Arthur Talbot Gascoyne-Cecil, 3d marquess of sôlzˈbərē [key], 1830–1903, British statesman. He entered Parliament in 1853 as a Conservative and devoted himself for 50 years to ...

oratory

(Encyclopedia)oratory, the art of swaying an audience by eloquent speech. In ancient Greece and Rome oratory was included under the term rhetoric, which meant the art of composing as well as delivering a speech. Or...

Abbasid

(Encyclopedia)Abbasid –sīd, –sĭd [key], Arab family descended from Abbas, the uncle of Muhammad. The Abbasids held the caliphate from 749 to 1258, but they were recognized neither in Spain nor (after 787) W o...

Long Island, island, United States

(Encyclopedia)Long Island (1990 pop. 6,861,454), 1,723 sq mi (4,463 sq km), 118 mi (190 km) long, and from 12 to 20 mi (19–32 km) wide, SE N.Y.; fourth largest island of the United States and the largest outside ...

Harvard University

(Encyclopedia)Harvard University, mainly at Cambridge, Mass., including Harvard College, the oldest American college. From two distinct schools, Radcliffe College for women (est. 1879, chartered 1894) and Harvar...

Great Depression

(Encyclopedia)Great Depression, in U.S. history, the severe economic crisis generally considered to have been precipitated by the U.S. stock-market crash of 1929. Although it shared the basic characteristics of oth...

Spielberg, Steven

(Encyclopedia)Spielberg, Steven, 1946–, American film director, b. Cincinnati, Ohio. Spielberg began his career as a television director, admired for his understanding portrayal of human character. His film Jaws ...

Boston, city, United States

(Encyclopedia)Boston, city (2020 pop. 692,600), state capital and seat of Suffolk co., E Mass., on Boston Bay, an arm of Massachusetts Bay; inc. 1822. The city includ...

Saint Kitts and Nevis

(Encyclopedia)CE5 Saint Kitts and Nevis or Saint Kitts–Nevis nēˈvĭs, nĕvˈĭs [key], officially Federation of Saint Kitts and Nevis, island nation (2015 est. pop. 52,000), 120 sq mi (311 sq km), West Indie...