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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 ...

Yverdon-les-Bains

(Encyclopedia)Yverdon-les-Bains ēvĕrdôNˈ-lā-bĕNˈ [key], Ger. Iferten, town (1990 pop. 22,758), Vaud canton, W Switzerland, at the south end of the Lake of Neuchâtel. It is an old spa with Roman ruins. Machi...

Marprelate controversy

(Encyclopedia)Marprelate controversy märˈprĕlˌĭt [key], a 16th-century English religious argument. Martin Marprelate was the pseudonym under which appeared several Puritan pamphlets (1588–89) satirizing the ...

Ruska, Ernst

(Encyclopedia)Ruska, Ernst, 1906–88, German electrical engineer. By applying the discovery that electron waves are 100,000 times shorter than those of light, Ruska built a microscope that used a beam of electrons...

raven

(Encyclopedia)raven, common name for the largest members of the family Corvidae (crow family), ranging throughout the arctic and temperate regions of the Northern Hemisphere. The common raven, Corvus corax, is a gl...

Ukrainka, Lesia

(Encyclopedia)Ukrainka, Lesia lāsˈyə o͝okrīnˈkə [key], 1871–1913, Ukrainian poet and dramatist, whose original name was Larysa Kvitka-Kosach. Ukrainka spent most of her life abroad fighting to recuperate f...

biogenetic law

(Encyclopedia)biogenetic law, in biology, a law stating that the earlier stages of embryos of species advanced in the evolutionary process, such as humans, resemble the embryos of ancestral species, such as fish. T...

minnesinger

(Encyclopedia)minnesinger mĭnˈĭsĭngˌər [key], a medieval German knight, poet, and singer of Minne, or courtly love. Originally imitators of Provençal troubadours, minnesingers developed their own style in th...

Bernadotte, Count Folke

(Encyclopedia)Bernadotte, Count Folke fôlˈkə bĕrnädôtˈ, bûrˈnədŏt [key], 1895–1948, Swedish internationalist; nephew of King Gustavus V. He was active in the Swedish Red Cross and became its president ...

Chacabuco, battle of

(Encyclopedia)Chacabuco, battle of, Feb. 12, 1817, fought between Chilean independence forces and Spanish troops. It took place just N of Santiago, Chile. José de San Martín, with Bernardo O'Higgins, assaulted an...