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planarian

(Encyclopedia)planarian, common name for several genera of the free-living (turbellarian) flatworms belonging to the order Tricladida, a name that derives from their characteristic three-branched digestive cavities...

barbiturate

(Encyclopedia)barbiturate bärbĭchˈərātˌ [key], any one of a group of drugs that act as depressants on the central nervous system. High doses depress both nerve and muscle activity and inhibit oxygen consumpti...

Thirty Years War

(Encyclopedia)Thirty Years War, 1618–48, general European war fought mainly in Germany. The general results of the war may be said to have been a tremendous decrease in German population; devastation of G...

Chinese Dynasties (table)

(Encyclopedia)Chinese Dynasties

Mann, Thomas

(Encyclopedia)Mann, Thomas tōˈmäs män [key], 1875–1955, German novelist and essayist, the outstanding German novelist of the 20th cent., b. Lübeck; brother of Heinrich Mann. A writer of great intellectual br...

adult education

(Encyclopedia)adult education, extension of educational opportunities to those adults beyond the age of general public education who feel a need for further training of any sort, also known as continuing education....

World War II

(Encyclopedia)World War II, 1939–45, worldwide conflict involving every major power in the world. The two sides were generally known as the Allies and the Axis. Although hostilities came to an end in Sept...

marijuana

(Encyclopedia)marijuana or marihuana, drug obtained from the flowering tops, stems, and leaves of the hemp plant, Cannabis sativa (see hemp) or C. indica; the latter species can withstand colder climates. It is one...

euthanasia

(Encyclopedia)euthanasia yo͞oˌthənāˈzhə [key], either painlessly putting to death or failing to prevent death from natural causes in cases of terminal illness or irreversible coma. The term comes from the Gre...

Castro, Fidel

(Encyclopedia)Castro, Fidel (Fidel Alejandro Castro Ruz) käsˈtrō [key], 1926–2016, Cuban revolutionary, premier of Cuba (1959–76), president of the Council of State and of the Council of Ministers (1976–2...