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agronomy

(Encyclopedia)agronomy əgrŏnˈəmē [key], branch of agriculture dealing with various physical and biological factors—including soil management, tillage, crop rotation, breeding, weed control, and climate—rel...

Wurtz, Charles Adolphe

(Encyclopedia)Wurtz, Charles Adolphe shärl ädôlfˈ vürts [key], 1817–84, French chemist. He was professor at the Sorbonne (1852–75), at the Faculty of Medicine, Paris (1853–75), and at the Faculty of Scie...

Abijah

(Encyclopedia)Abijah əbīˈjə [key], in the Bible. 1 See Abi. 2 Died c.911 b.c., king (c.914–c.911 b.c.) of Judah, the southern kingdom. He succeeded his father, Rehoboam, and King Jeroboam continued warfare ag...

commando

(Encyclopedia)commando, small, elite military raiding and assault unit or soldier. Although the word was coined in the Boer War (1899–1902), the role is as old as battles themselves. In 1940, when the British org...

White, Andrew Dickson

(Encyclopedia)White, Andrew Dickson, 1832–1918, American educator and diplomat, b. Homer, N.Y., briefly attended Geneva (now Hobart) College, grad. Yale, 1853. He studied in France and Germany, served (1854–55)...

Vishniac, Roman

(Encyclopedia)Vishniac, Roman vĭshˈnēăk [key], 1897–1990, Russian-American biologist, photographer, linguist, art historian, and philosopher, b. Pavlosk, near St. Petersburg. Vishniac took degrees in medicine...

Abd ar-Rahman III, emir and caliph of Córdoba

(Encyclopedia)Abd ar-Rahman III, 891–961, Umayyad emir (912–29) and first caliph (929–61) of Córdoba. When he succeeded to the throne, the Spanish emirate was reduced to Córdoba and its environs and beset w...

Vladimir II

(Encyclopedia)Vladimir II (Vladimir Monomakh) or Volodymyr II, 1053–1125, grand duke of Kiev (1113–25); son of Vsevolod I, prince of Pereyaslavl and grand duke of Kiev (ruled 1078–93). On his father's death h...

Boleslav I

(Encyclopedia)Boleslav I bōˈləsläfˌ [key], d. 967, duke of Bohemia (929–67). He became duke by assassinating his elder brother, Duke Wenceslaus (see Wenceslaus, Saint). Although Boleslav was involved in cons...

fortification

(Encyclopedia)fortification, system of defense structures for protection from enemy attacks. Fortification developed along two general lines: permanent sites built in peacetime, and emplacements and obstacles hasti...