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hertz

(Encyclopedia)hertz hûrts [key] [for Heinrich R. Hertz], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the kilohertz (1,000 Hz...

Rose, Gustav

(Encyclopedia)Rose, Gustav go͝osˈtäf rōˈzə [key], 1798–1873, German mineralogist. He served as professor at the Univ. of Berlin from 1839. Noted especially as a crystallographer, he advanced the scientific ...

Hernández, José

(Encyclopedia)Hernández, José hōsāˈ ārnänˈdĕs [key], 1834–86, Argentine poet, journalist, and soldier. Hernández lived in the pampas as a child. He was the author of the national classic of gaucho liter...

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 ...

King, Coretta Scott

(Encyclopedia)King, Coretta Scott, 1927–2006, American civil-rights leader, b. Heiberger, Ala.; the wife (1953–68) of Martin Luther King, Jr. After her husband's assassination, she carried on his civil-rights w...

Neruda, Jan

(Encyclopedia)Neruda, Jan yän nĕˈro͝odä [key], 1834–91, Czech essayist and poet, b. Prague. His popular Stories from Malá Strana (1878), tales drawn from his childhood in Prague and satiric portraits of mem...

Lorelei

(Encyclopedia)Lorelei lôrˈəlī, Ger. lōˈrəlī [key], cliff, 433 ft (132 m) high, on the right bank of the Rhine River, near St. Goarshausen, W Germany, about midway between Koblenz and Bingen. There the Rhine...

Tiryns

(Encyclopedia)Tiryns tīˈrĭnz [key], ancient city of Greece, in the NE Peloponnesus, 2.5 mi (4 km) N of Nauplia (now Návplion) and near Argos. The site seems to have been inhabited since the 3d millennium b.c. I...

Martin, Saint, c.316–397, bishop of Tours

(Encyclopedia)Martin, Saint, c.316–397, bishop of Tours. Born a heathen in Pannonia (in modern Hungary), the son of a soldier, he became a convert and refused to fight Christians. He went (c.360) to St. Hilary of...

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...