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Ludwig, Carl Friedrich Wilhelm

(Encyclopedia)Ludwig, Carl Friedrich Wilhelm kärl frēˈdrĭkh vĭlˈhĕlm lo͞otˈvĭkh [key], 1816–95, German physiologist. He became world famous as professor (from 1865) and head of the physiological institu...

Lukashenko, Aleksandr Grigoryevich

(Encyclopedia)Lukashenko, Aleksandr Grigoryevich əlyĭksänˈdər grĭgôrˈyəvĭch lo͞okäshĕnˈkô [key], Belarusian Alyaksandr Ryhoravich Lukashenka, 1954–, Belarusian politician, president of Belarus (199...

luminosity

(Encyclopedia)luminosity, in astronomy, the rate at which energy of all types is radiated by an object in all directions. A star's luminosity depends on its size and its temperature, varying as the square of the ra...

lung cancer

(Encyclopedia)lung cancer, cancer that originates in the tissues of the lungs. Lung cancer is the leading cause of cancer death in the United States in both men and women. Like other cancers, lung cancer occurs aft...

Luria, Salvador Edward

(Encyclopedia)Luria, Salvador Edward, 1912–1991, American physician, b. Turin, Italy, M.D., Univ. of Turin, 1935. He conducted research and taught at the Institute of Radium in Paris (1938–40), Columbia (1940�...

Lusignan

(Encyclopedia)Lusignan lüzēnyäNˈ [key], French noble family. The name is derived from a castle in Poitou, built, according to legend, by Mélusine. The family was powerful in the Middle Ages and ruled (13th–1...

Luther, Martin

(Encyclopedia)Luther, Martin, 1483–1546, German leader of the Protestant Reformation, b. Eisleben, Saxony, of a family of small, but free, landholders. At Wittenberg the iconoclasts under Carlstadt had institut...

Luxembourg, grand duchy, W Europe

(Encyclopedia)CE5 Luxembourg lŭkˈsəmbûrg, Ger. lo͝okˈsəmbo͝orkh [key], officially Grand Duchy of Luxembourg, grand duchy (2015 est. pop. 567,000), 998 sq mi (2,586 sq km), W Europe. Roughly triangular, i...

Luxeuil

(Encyclopedia)Luxeuil lüksöˈyə [key], former abbey, E France, at the present-day town of Luxeuil-les-Bains. It was founded c.590 by St. Columban on the site of the Roman town Luxovium, destroyed (451) by Attila...

Lviv

(Encyclopedia)Lviv ləvēˈo͞o, ləvēfˈ [key], Rus. Lvov, Pol. Lwów, Ger. Lemberg, city (1989 pop. 791,000), capital of Lviv region, W Ukraine, at the watershed of the Western Bug and Dniester rivers and in the...