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spirit level

(Encyclopedia)spirit level, tool for determining whether a surface is horizontal. It consists essentially of a slightly bent transparent tube that is held in a frame. The tube contains some alcohol, ether, or simil...

versification

(Encyclopedia)versification, principles of metrical practice in poetry. In different literatures poetic form is achieved in various ways; usually, however, a definite and predictable pattern is evident in the langu...

Christian IX

(Encyclopedia)Christian IX, 1818–1906, king of Denmark (1863–1906). A member of the cadet line of Sonderburg-Glücksburg, he succeeded Frederick VII, last of the direct line of Oldenburg. The London Conference ...

median

(Encyclopedia)median. 1 In statistics, a type of average. In a group of numbers as many numbers of the group are larger than the median as are smaller. In the group 4, 5, 6, 9, 13, 14, 19, the median is 9, three nu...

hyperbola

(Encyclopedia)CE5 Hyperbola hyperbola hīpûrˈbələ [key], plane curve consisting of all points such that the difference between the distances from any point on the curve to two fixed points (foci) is the sam...

apsis

(Encyclopedia)CE5 Apsis points, or apsides, in the earth's orbit: At perihelion the earth is closest to the sun and at aphelion it is farthest from the sun. apsis (pl. apsides), point in the orbit of a body whe...

longitude

(Encyclopedia)longitude lŏnˈjĭto͞odˌ [key], angular distance on the earth's surface measured along any latitude line such as the equator east or west of the prime meridian. A meridian of longitude is an imagin...

Mannerheim, Baron Carl Gustav Emil

(Encyclopedia)Mannerheim, Baron Carl Gustav Emil kärl gŭˈstäv āˈmĭl mäˈnərhām [key], 1867–1951, Finnish field marshal and president of Finland (1944–46). Of a distinguished Swedish-Finnish family in ...

trench warfare

(Encyclopedia)trench warfare. Although trenches were used in ancient and medieval warfare, in the American Civil War, and in the Russo-Japanese War (1904–5), they did not become important until World War I. The i...

spectrum

(Encyclopedia)CE5 Dispersion of white light by a triangular prism spectrum, arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other propert...