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	fifth column ... Read more
	entasis entasis [Gr.,=stretching], the slight convex curvature of a classical column that diminishes in diameter as it rises. This device, as used by Greek builders, was of extreme subtlety, the freehand curvature being merely sufficient to guard the contours of the column from any appearance of inward... Read more
	column column vertical architectural support, circular or polygonal in plan. A column is generally at least four or five times as high as its diameter or width; stubbier freestanding masses of masonry are usually called piers or pillars, particularly those with a rectangular plan. In fully developed... Read more
	periodic table periodic table chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley . In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled Periodic Table... Read more
	chromatography chromatography , resolution of a chemical mixture into its component compounds by passing it through a system that retards each compound to a varying degree; a system capable of accomplishing this is called a chromatograph. The retarding system can be a surface adsorbant, such as silica, alumina,... Read more
	vertebra vertebra In the axial skeleton of vertebrates, one of a series of bony segments formed at the skeletagenous septum and myoseptum junction which replace the notochord, forming the vertebral column (or spinal column or backbone), which encases and so protects the spinal cord. Vertebrae differentiate... Read more
	Eiffel Tower Eiffel Tower structure designed by A. G. Eiffel and erected in the Champ-de-Mars for the Paris exposition of 1889. The tower is 984 ft (300 m) high and consists of an iron framework supported on four masonry piers, from which rise four columns uniting to form one shaft. Three platforms at different... Read more
	Halogen elements HALOGENS CONCEPT Table salt, bleach, fluoride in toothpaste, chlorine in swimming pools—what do all of these have in common? Add halogen lamps to the list, and the answer becomes more clear: all involve one or more of the halogens, which form Group 7 of the periodic table of elements. Known... Read more
	Walter Lippmann Walter Lippmann 1889-1974, American essayist and editor, b. New York City. He was associate editor of the New Republic in its early days (1914-17), but at the outbreak of World War I he left to become Assistant Secretary of War, later helping to prepare data for the peace conference. From 1921 to... Read more
	vertebral column vertebral column (backbone; spinal column; spine) A flexible bony column in vertebrates that extends down the long axis of the body and provides the main skeletal support. It also encloses and protects the spinal cord and provides attachment for the muscles of the back. The vertebral column consists... Read more