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Macdonald-Wright, Stanton

(Encyclopedia)Macdonald-Wright, Stanton, 1890–1973, American artist, b. Charlottsville, Va. Macdonald-Wright was among the first Americans to paint in a totally abstract mode. Together with Morgan Russell, he fou...

paradise fish

(Encyclopedia)paradise fish, brilliantly colored freshwater Asian fish, Macropodus opercularis, often kept in aquariums. The males reach a length of 3 in. (7.6 cm) and turn reddish with blue bars during mating seas...

spinel

(Encyclopedia)spinel, magnesium aluminum oxide, MgAl2O4, a mineral crystallizing in the isometric system, usually as octahedrons. It occurs as an accessory mineral in basic igneous rocks, in aluminum-rich metamorph...

cobalt, chemical element

(Encyclopedia)cobalt, metallic chemical element; symbol Co; at. no. 27; at. wt. 58.9332; m.p. 1,495℃; b.p. about 2,870℃; sp. gr. 8.9 at 20℃; valence +2 or +3. Cobalt is a silver-white, lustrous, hard, brittle...

quantum chromodynamics

(Encyclopedia)quantum chromodynamics (QCD), quantum field theory that describes the properties of the strong interactions between quarks and between protons and neutrons in the framework of quantum theory. Quarks p...

Chattanooga campaign

(Encyclopedia)Chattanooga campaign, Aug.-Nov., 1863, military encounter in the American Civil War. Chattanooga, Tenn., which commanded Confederate communications between the East and the Mississippi River and was a...

island

(Encyclopedia)island, relatively small body of land surrounded entirely by water. (As the oceans form a continuous mass of water on the earth's surface, all continents are islands in the strict sense of the word.) ...

East Sussex

(Encyclopedia)East Sussex, county, 693 sq mi (1,795 sq km), extreme SE England. It comprises five administrative districts: Eastbourne, Hastings, Lewes, Rother, and W...

Chertoff, Michael

(Encyclopedia)Chertoff, Michael, 1953–, U.S. government official, b. Elizabeth, N.J., grad. Harvard (B.A., 1975, J.D., 1978). A lawyer, Chertoff was an assistant federal prosecutor in New York (1983–87) and New...

aardwolf

(Encyclopedia)aardwolf ärdˈwo͝olf [key], carnivore of the hyena family. The aardwolf, Proteles cristatus, resembles the true hyena but is smaller and more delicate. It has less powerful teeth and jaws and five i...