Columbia Encyclopedia

Search results

255 results found

seal, stamp

(Encyclopedia)seal, stamp made from a die or matrix of metal, a gem, or other hard substance that yields an impression on wax or other soft substance. The use of seals is very ancient, examples of great antiquity o...

corona, in astronomy

(Encyclopedia)corona, luminous envelope surrounding the sun, outside the chromosphere. Its density is less than one billionth that of the earth's atmosphere. The corona is visible only at the time of totality durin...

Alegría, Claribel

(Encyclopedia)Alegría, Claribel, 1924–2018, Nicaraguan-Salvadoran poet, b. Nicaragua as Clara Isabel Alegría Vides, grad. George Washington Univ. (B.A., 1948). Her family went into exile in El Salvador when she...

Orbiting Geophysical Observatory

(Encyclopedia)Orbiting Geophysical Observatory (OGO), series of six orbiting observatories (see observatory, orbiting) launched between 1964 and 1969 by the National Aeronautics and Space Administration (NASA) to s...

Kalidasa

(Encyclopedia)Kalidasa käˌlĭdäˈsə [key], fl. 5th cent.?, Indian dramatist and poet. He is regarded as the greatest figure in classical Sanskrit literature. Except that he was retained by the Gupta court, no f...

center of mass

(Encyclopedia)center of mass, the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with the center of t...

lapwing

(Encyclopedia)lapwing, common name for some members of the family Charadriidae, which includes the plovers. Lapwings are almost all inland or upland birds, found in all temperate and tropical regions except North A...

tent

(Encyclopedia)tent, portable shelter of canvas, skins, felt, matting, or other material usually supported by poles and used chiefly by nomads, hunters, and campers. Tents have been used by pastoral peoples since an...

Chambers, Whittaker

(Encyclopedia)Chambers, Whittaker, 1901–61, U.S. journalist and spy, b. Philadelphia. He joined the U.S. Communist party in 1925 and wrote for its newspaper before engaging (1935–38) in espionage for the USSR. ...

anchor

(Encyclopedia)anchor, device cast overboard to secure a ship, boat, or other floating object by means of weight, friction, or hooks called flukes. In ancient times an anchor was often merely a large stone, a bag or...