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Ronne, Finn

(Encyclopedia)Ronne, Finn, 1899–1980, Norwegian-American Antarctic explorer. Ronne graduated from college in Norway in 1922 and immigrated to the United States. His first of nine Antarctic expeditions was with Ad...

sword

(Encyclopedia)sword, weapon of offense and defense in personal combat, consisting of a blade with a sharp point and one or two cutting edges, set in a hilt with a handle protected by a metal case or cross guard. Th...

Hall, Charles Francis

(Encyclopedia)Hall, Charles Francis, 1821–71, American arctic explorer, b. Rochester, N.H. He became interested in the many search expeditions for Sir John Franklin's party, and with Eskimo companions he explored...

Franz Josef Land

(Encyclopedia)Franz Josef Land frăns jōˈzəf, fränts yōˈzĕf [key], Rus. Zemlya Frantsa Iosifa, archipelago, c.6,300 sq mi (16,320 sq km), in the Arctic Ocean N of Novaya Zemlya, Russia. It consists of more t...

Pichegru, Charles

(Encyclopedia)Pichegru, Charles shärl pēshgrüˈ [key], 1761–1804, French general in the French Revolutionary Wars. Successful on the Rhine front (1793), he invaded (1794) the Netherlands, entered (1795) Amster...

glaucoma

(Encyclopedia)glaucoma glôkōˈmə [key], ocular disorder characterized by pressure within the eyeball caused by an excessive amount of aqueous humor (the fluid substance filling the eyeball). This causes pressure...

Bulfinch, Thomas

(Encyclopedia)Bulfinch, Thomas, 1796–1867, American author, b. Newton, Mass., grad. Harvard, 1814. He wrote a series of works popularizing fable and legend, including The Age of Fables (1855), The Age of Chivalry...

mass extinction

(Encyclopedia)mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five greatest were thos...

Gerlache, Adrien de

(Encyclopedia)Gerlache, Adrien de ädrē-ăN də gĕrläshˈ [key], 1866–1934, Belgian naval officer and explorer. Sailing with Norwegian explorer Roald Amundsen who would later be the first to reach the South Po...

Jaya Peak

(Encyclopedia)Jaya or Djaja Peak both: jäˈyə [key], highest mountain peak on Mt. Jayawijaya, in the Sudirman Mts., Papua prov., Indonesia, on W New Guinea, rising to 16,503 ft (5,031 m). It is the highest point ...