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Limburg, province, Belgium

(Encyclopedia)Limburg lĭmˈbûrg, Du. lĭmˈbûrkh [key], Fr. Limbourg, province (1991 pop. 750,435), 930 sq mi (2,409 sq km), NE Belgium, bordering on the Netherlands in the north. The chief cities are Hasselt (t...

lawrencium

(Encyclopedia)lawrencium, artificially produced radioactive chemical element; symbol Lr; at. no. 103; mass number of most stable isotope 262; m.p. about 1,627℃; b.p. and sp. gr. unknown; valence +3. Lawrencium is...

fermium

(Encyclopedia)fermium fûrˈmēəm [key] [for Enrico Fermi], artificially produced radioactive chemical element; symbol Fm; at. no. 100; mass no. of most stable isotope 257; m.p. 1,527℃; b.p. and sp. gr. unknown;...

Brownian movement

(Encyclopedia)Brownian movement or motion, zigzag, irregular motion exhibited by minute particles of matter when suspended in a fluid. The effect has been observed in all types of colloidal suspensions (see colloid...

aspirin

(Encyclopedia)aspirin, acetyl derivative of salicylic acid (see salicylate) that is used to lower fever, relieve pain, reduce inflammation, and thin the blood. Common conditions treated with aspirin include headach...

urea

(Encyclopedia)CE5 urea yo͝oēˈə [key], organic compound that is the principal end product of nitrogen metabolism in most mammals. Urea was the first animal metabolite to be isolated in crystalline form; its c...

harmonica

(Encyclopedia)harmonica. 1 The simplest of the musical instruments employing free reeds, known also as the mouth organ or French harp. It was probably invented in 1829 by Friedrich Buschmann of Berlin, who called h...

cerium

(Encyclopedia)cerium sērˈēəm [key] [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799℃; b.p. 3,426℃; sp. gr. 6.77 at 25℃; valence +3 or +4. Cerium is a ...

Livonian Brothers of the Sword

(Encyclopedia)Livonian Brothers of the Sword or Livonian Knights lĭvōˈnēən [key], German military and religious order, founded in 1202 by Bishop Albert of Livonia for the purpose of conquest and Christianizati...

Magnus VII

(Encyclopedia)Magnus VII (Magnus Ericsson), b.1316, d.1373 or 1374, king of Norway (1319–43) and Sweden (1319–63). He succeeded his grandfather, Haakon V, in Norway; at the same time he was elected king by the ...