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radiochemistry

(Encyclopedia)radiochemistry, chemistry of radioactive substances (see radioactivity). Radioactive isotopes are very useful as tracers to study the mechanisms of complex organic reactions, since even minute amounts...

Juneteenth

(Encyclopedia)Juneteenth or Emancipation Day, June 19th, holiday celebrating the end of slavery in the United States. It began in Texas when news of Lincoln's Emancipation Proclamation (effective Jan. 1, 1863) fina...

Tafilalt

(Encyclopedia)Tafilalt –lĕt [key], oasis in the Sahara, SE Morocco, c.530 sq mi (1,370 sq km). It has date groves and small trading settlements. After c.760 it was an independent kingdom for nearly two centuries...

Manchester, cities, United States

(Encyclopedia)Manchester. 1 Town (1990 pop. 51,618), Hartford co., central Conn.; settled c.1672, inc. 1823. Its sawmills and paper mills date from before the Revolutionary War. The city was also known for its prod...

Royal Academy of Arts

(Encyclopedia)Royal Academy of Arts, London, the national academy of art of England, founded in 1768 by George III at the instigation of Sir William Chambers and Benjamin West. Sir Joshua Reynolds was the Academy's...

Saint John's, city, N.L., Canada

(Encyclopedia)Saint John's, city (2001 pop. 99,182), provincial capital, Newfoundland and Labrador, Canada, on the northeast coast of the Avalon Peninsula, SE Newfoundland island. Built on hills overlooking a fine ...

depreciation

(Encyclopedia)depreciation, in accounting, reduction in the value of fixed or capital assets, as by use, damage, weathering, or obsolescence. It can be estimated according to a number of methods. In the straight-li...

turkey , in zoology

(Encyclopedia)turkey, common name for a large game and poultry bird related to the grouse and the pheasant. Its name derives from its “turk-turk” call. Turkeys are indigenous to the New World; American fossils ...

pulpit

(Encyclopedia)pulpit, in churches, elevated platform with low enclosing sides, used for preaching the sermon. In the earliest churches the episcopal throne served this purpose. The boxlike elevated ambo of early me...