Columbia Encyclopedia

Search results

500 results found

Sistan

(Encyclopedia)Sistan sā– [key], border lowland region of SW Afghanistan and E Iran, c.6,000 sq mi (15,540 sq km), fed mainly by the spring flood of the Helmand River and other streams. At low water, the region i...

angstrom

(Encyclopedia)angstrom ăngˈstrəm [key], abbr. Å, unit of length equal to 10−10 meter (0.0000000001 meter); it is used to measure the wavelengths of visible light and of other forms of electromagnetic radiatio...

hydrometer

(Encyclopedia)hydrometer hīdrŏmˈətər [key], device used to determine directly the specific gravity of a liquid. It usually consists of a thin glass tube closed at both ends, with one end enlarged into a bulb t...

Poitier, Sir Sidney

(Encyclopedia)Poitier, Sir Sidney, 1927–2022, Bahamian-American actor, b. Miami, raised in the Bahamas, returned to the United States at 14. Poitier served in the 1...

Teutonic Knights

(Encyclopedia)Teutonic Knights or Teutonic Order to͞otŏnˈĭk [key], German military religious order founded (1190–91) during the siege of Acre in the Third Crusade. It was originally known as the Order of the ...

radioimmunoassay

(Encyclopedia)radioimmunoassay (RIA), highly sensitive laboratory technique used to measure minute amounts of substances including antigens, hormones, and drugs present in the body. The substance or antigen (a fore...

Northwest Territories

(Encyclopedia)CE5 Northwest Territories, territory (2001 pop. 37,360), 532,643 sq mi (1,379,028 sq km), NW Canada. The Northwest Territories lie W of Nunavut, N of lat. 60°N, and E of Yukon. Until 1999, when th...

Charpak, Georges

(Encyclopedia)Charpak, Georges zhôrzh shärpäkˈ [key], 1924–2010, French physicist, b. Dąbrowica, Poland (now Dubrovytsia, Ukraine), Ph.D Collège de France, 1954. Affiliated with CERN (1959–91), Charpak wo...

Delambre, Jean Baptiste Joseph

(Encyclopedia)Delambre, Jean Baptiste Joseph zhäN bätēstˈ zhôzĕfˈ dəläNˈbrə [key], 1749–1822, French astronomer and mathematician. He was a member of the bureau of longitudes from 1795 and professor at...

frontier

(Encyclopedia)frontier, in U.S. history, the border area of settlement of Europeans and their descendants; it was vital in the conquest of the land between the Atlantic and the Pacific. The importance of the westwa...