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Ptolemaic system

(Encyclopedia)Ptolemaic system tŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the center of the universe with a...

Cistercians

(Encyclopedia)Cistercians sĭstrˈshənz [key], monks of a Roman Catholic religious order founded (1098) by St. Robert, abbot of Molesme, in Cîteaux [Cistercium], Côte-d'Or dept., France. They reacted against Clu...

Pearl Harbor

(Encyclopedia)Pearl Harbor, land-locked harbor, on the southern coast of Oahu island, Hawaii, W of Honolulu; one of the largest and best natural harbors in the E Pacific Ocean. In the vicinity are many U.S. militar...

Togoland

(Encyclopedia)Togoland tōˈgō [key], historic region (c.33,500 sq mi/86,800 sq km), W Africa, bordering on the Gulf of Guinea in the south. The western section of Togoland is now part of Ghana, and the eastern po...

nomad

(Encyclopedia)nomad nōˈmădˌ [key], one of a group of people without fixed habitation, especially pastoralists. (Some authorities prefer the terms “nonsedentary” or “migratory” rather than “nomadic” ...

Sunday school

(Encyclopedia)Sunday school, institution for instruction in religion and morals, usually conducted in churches as part of the church organization but sometimes maintained by other religious or philanthropic bodies....

locomotive

(Encyclopedia)locomotive, vehicle used to pull a train of unpowered railroad cars. Richard Trevithick, a British engineer and inventor, built and operated (1803–4) the first successful steam engine locomotive f...

cell, in biology

(Encyclopedia)CE5 Animal cell cell, in biology, the unit of structure and function of which all plants and animals are composed. The cell is the smallest unit in the living organism that is capable of integrati...

Mamet, David

(Encyclopedia)Mamet, David mămĕtˈ [key], 1947–, American playwright and film director, b. Chicago. He taught drama (and produced some of his early plays) at Goddard College. His work, often dealing with the su...

Cossacks

(Encyclopedia)Cossacks kŏsˈăks, –əks [key], Rus. Kazaki, Ukr. Kozaky, peasant-soldiers in Ukraine and in several regions of Russia who, until 1918, held certain privileges in return for rendering military ser...