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Ordinance of 1787

(Encyclopedia)Ordinance of 1787, adopted by the Congress of Confederation for the government of the Western territories ceded to the United States by the states. It created the Northwest Territory and is frequently...

oxycodone

(Encyclopedia) oxycodone is a synthetic opioid developed to treat pain. Oxycodone was originally developed in Germany in 1917 from a synthesis of thebaine, an alkaloi...

Hoffa, Jimmy

(Encyclopedia)Hoffa, Jimmy (James Riddle Hoffa) hôfˈə [key], 1913–75?, U.S. labor leader, b. Brazil, Indiana. As a young warehouseman he organized (1932) a union that was admitted two years later into the Team...

hydrolysis

(Encyclopedia)hydrolysis hīdrŏlˈĭsĭs [key], chemical reaction of a compound with water, usually resulting in the formation of one or more new compounds. The most common hydrolysis occurs when a salt of a weak ...

hysteresis

(Encyclopedia)hysteresis hĭsˌtərēˈsĭs [key], phenomenon in which the response of a physical system to an external influence depends not only on the present magnitude of that influence but also on the previous...

Steichen, Edward

(Encyclopedia)Steichen, Edward stīˈkən [key], 1879–1973, American photographer, b. Luxembourg, reared in Hancock, Mich. Steichen is credited with the transformation of photography into an art form. At 16, whil...

perspective

(Encyclopedia)perspective, in art, any method employed to represent three-dimensional space on a flat surface or in relief sculpture. Although many periods in art showed some progressive diminution of objects seen ...

Waterloo campaign

(Encyclopedia)Waterloo campaign, last action of the Napoleonic Wars, ending with the battle of Waterloo. Napoleon I, who escaped from Elba in Feb., 1815, and entered Paris on Mar. 20, soon faced a European coalitio...

waters, territorial

(Encyclopedia)waters, territorial, all waters within the jurisdiction, recognized in international law, of a country. Certain waters by their situation are controlled by one nation; these include wholly enclosed in...

Weyden, Roger van der

(Encyclopedia)Weyden, Roger van der vän dər vīˈdən [key], c.1400–1464, major early Flemish master, known also as Roger de la Pasture. He is believed to have studied with Robert Campin. His early works also s...