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Volgograd

(Encyclopedia)Volgograd vôlgəgrätˈ [key], formerly Stalingrad, city (1989 pop. 999,000), capital of Volgograd region, SE European Russia, a port on the Volga River and the eastern terminus of the Volga-Don Cana...

symbolic logic

(Encyclopedia)symbolic logic or mathematical logic, formalized system of deductive logic, employing abstract symbols for the various aspects of natural language. Symbolic logic draws on the concepts and techniques ...

Anatolian languages

(Encyclopedia)Anatolian languages ănˌətōˈlēən [key], subfamily of the Indo-European family of languages (see The Indo-European Family of Languages, tableIndo-European, table); the term “Anatolian languages...

Humboldt, Alexander, Freiherr von

(Encyclopedia)Humboldt, Alexander, Freiherr von hŭmˈbōlt, Ger. älĕksänˈdər frīˈhĕr fən ho͝omˈbôlt [key], 1769–1859, German naturalist, inventor, explorer, and author, the most eminent scientist of ...

parallax

(Encyclopedia)CE5 The trigonometric parallax of a star, expressed by the angle θ, is a measure of its apparent motion against the background of more distant stars as a result of the earth's motions in its orbit...

aluminum

(Encyclopedia)aluminum ălˌyo͞omĭnˈēəm [key], metallic chemical element; symbol Al; at. no. 13; at. wt. 26.98154; m.p. 660.37℃; b.p. 2,467℃; sp. gr. 2.6989 at 20℃; valence +3. Aluminum is a silver-white...

Swiss literature

(Encyclopedia)Swiss literature. The literature of Switzerland is written in German, French, Italian, and Romansh, with German predominating. The extensive literature in Romansh dialect (see Rhaeto-Romanic) is littl...

Weimar

(Encyclopedia)Weimar vīˈmär [key], city (1994 pop. 58,807), E Thuringia, central Germany, on the Ilm River. It is an industrial, transportation, and cultural center. Manufactures include agricultural machinery, ...

chemistry

(Encyclopedia)chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

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