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relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

observatory

(Encyclopedia)observatory, scientific facility especially equipped to detect and record naturally occurring scientific phenomena. Although geological and meteorological observatories exist, the term is generally ap...

Strategic Defense Initiative

(Encyclopedia)Strategic Defense Initiative (SDI), former U.S. government program responsible for research and development of a space-based system to defend the nation from attack by strategic ballistic missiles (se...

empyema

(Encyclopedia)empyema ĕmpē-ēˈmə [key], persistent purulent discharge into a cavity such as the pleural space or the gallbladder. Empyema results as a complication of bacterial infections such as pneumonia and ...

Bourget, Le

(Encyclopedia)Bourget, Le, town, Seine–Saint-Denis dept., N central France. A suburb of Paris, it is the site of Le Bourget airport, once Paris's main airport but n...

Steer, Philip Wilson

(Encyclopedia)Steer, Philip Wilson, 1860–1942, English landscape painter. Steer worked largely in the tradition of French impressionist painting and was considered the greatest English landscape painter of his da...

Laning, Edward

(Encyclopedia)Laning, Edward lănˈĭng [key], 1906–1981, American painter, b. Petersburg, Ill., studied Art Institute of Chicago and Art Students League of New York. He is best known as a painter of murals for p...

Lancaster, city, England

(Encyclopedia)Lancaster lăngˈkəstər [key], city (1991 pop. 43,902) and district, county seat of Lancashire, NW England, on the Lune River. The city's products include furniture, textiles, synthetic fiber, farm ...

Asyut

(Encyclopedia)Asyut äsyo͞otˈ [key], city (1986 pop. 272,986), E central Egypt, on the Nile. An industrial and trading center and also the seat of a university, it is famed for pottery, carved bone and wood, leat...

Meridian

(Encyclopedia)Meridian mərĭdˈēən [key], city (1990 pop. 41,036), seat of Lauderdale co., E Miss., near the Ala. line; settled 1831, inc. 1860. It is an important rail and highway point and the trade and shippi...