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sea urchin

(Encyclopedia)sea urchin, spherical-shaped echinoderm with movable spines covering the body. The body wall is a firm, globose shell, or test, made of fused skeletal plates and marked by regularly arranged tubercles...

revolution

(Encyclopedia)revolution, in a political sense, fundamental and violent change in the values, political institutions, social structure, leadership, and policies of a society. The totality of change implicit in this...

Alcibiades

(Encyclopedia)Alcibiades ălsĭbīˈədēz [key], c.450–404 b.c., Athenian statesman and general. Of the family of Alcmaeonidae, he was a ward of Pericles and was for many years a devoted attendant of Socrates. H...

Lesbos

(Encyclopedia)Lesbos lāzˈvôs [key], island (1991 pop. 87,151), c.630 sq mi (1,630 sq km), E Greece, in the Aegean Sea near Turkey. A fertile island, it has vast olive groves and also produces wheat, wine, and ci...

zoology

(Encyclopedia)zoology, branch of biology concerned with the study of animal life. From earliest times animals have been vitally important to man; cave art demonstrates the practical and mystical significance animal...

Bacon, Roger

(Encyclopedia)Bacon, Roger, c.1214–1294?, English scholastic philosopher and scientist, a Franciscan. He studied at Oxford as well as at the Univ. of Paris and became one of the most celebrated and zealous teache...

jurisprudence

(Encyclopedia)jurisprudence jo͝orˌĭspro͞odˈəns [key], study of the nature and the origin and development of law. It is variously regarded as a branch of ethics or of sociology. Many of the major systematic ph...

British Library

(Encyclopedia)British Library, national library of Great Britain, located in London; one of the world's great libraries. Long a part of the British Museum, the library collection originated in 1753 when the governm...

guidance and counseling

(Encyclopedia)guidance and counseling, concept that institutions, especially schools, should promote the efficient and happy lives of individuals by helping them adjust to social realities. The disruption of commun...

Morris, Mark

(Encyclopedia)Morris, Mark 1956–, American dancer and choreographer, b. Seattle, Wash. After training in Balkan folk dance, flamenco, and ballet, he went on to dance for Eliot Feld, Laura Dean, and Lar Lubovitch....