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parabola

(Encyclopedia)CE5 Parabola parabola pərăbˈələ [key], plane curve consisting of all points equidistant from a given fixed point (focus) and a given fixed line (directrix) (see illustration). It is the conic...

Hirschfeld, Al

(Encyclopedia)Hirschfeld, Al (Albert Hirschfeld) hûrshˈfĕld [key], 1903–2003, American graphic artist, b. St. Louis. He and his family moved to New York City when he was 12, and he studied art there and in Par...

John IV, king of Portugal

(Encyclopedia)John IV, 1604–56, king of Portugal (1640–56). He succeeded as duke of Braganza in 1630. Descended from Manuel I and in illegitimate line from John I, he had the strongest claim to the Portuguese t...

airmail

(Encyclopedia)airmail, transport of mail by airplanes. Demonstration flights that showed the feasibility of carrying mail by air were made in Great Britain and in the United States in 1911. In the United States, af...

World Trade Organization

(Encyclopedia)World Trade Organization (WTO), international organization established in 1995 as a result of the final round of the General Agreement on Tariffs and Trade (GATT) negotiations, called the Uruguay Roun...

Great Dividing Range

(Encyclopedia)Great Dividing Range, crest line of the Eastern Highlands of Australia. For the most part it separates rivers draining into the Pacific Ocean from those flowing into the Indian Ocean and the Arafura S...

Uranium City

(Encyclopedia)Uranium City, town, NW Sask., Canada, on Lake Athabasca near the Northwest Territories line. A large uranium-mining area from the 1950s, the closure of its mines in 1982 has led to economic collapse. ...

Cremer, Sir William Randal

(Encyclopedia)Cremer, Sir William Randal krēˈmər [key], 1828–1908, English pacifist. At first active in trade unionism, he gradually expanded his work and interests, becoming one of the most active advocates o...

Fried, Alfred Hermann

(Encyclopedia)Fried, Alfred Hermann älˈfrāt hĕrˈmän frēt [key], 1864–1921, Austrian pacifist. He moved to Berlin, where he was a bookseller and a writer. Influenced by Bertha von Suttner, he devoted himsel...

circle

(Encyclopedia)CE5 Circle circle, closed plane curve consisting of all points at a given distance from some fixed point, called the center. A circle is a conic section cut by a plane perpendicular to the axis of...