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Aiken, Conrad

(Encyclopedia)Aiken, Conrad āˈkĭn [key], 1889–1973, American author, b. Savannah, Ga., grad. Harvard, 1912. Aiken is best known for his poetry, which often is preoccupied with the sound and structure of music;...

stratification

(Encyclopedia)stratification (Lat.,=made in layers), layered structure formed by the deposition of sedimentary rocks. Changes between strata are interpreted as the result of fluctuations in the intensity and persis...

agate

(Encyclopedia)agate ăgˈĭt [key], translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony. Agates are identical in chemical structure to jasper, flint, chert, petrified wood, and tiger's-e...

centering

(Encyclopedia)centering, the framework of wood or of wood and steel built to support a masonry arch or vault during its construction. The centering itself must be rigidly supported, either by posts from the ground ...

vertebrate

(Encyclopedia)vertebrate, any animal having a backbone or spinal column. Verbrates can be traced back to the Silurian period. In the adults of nearly all forms the backbone consists of a series of vertebrae. All ve...

Vesalius, Andreas

(Encyclopedia)Vesalius, Andreas vĭsāˈlēəs [key], 1514–64, Flemish anatomist. He made many discoveries in anatomy and became noted as professor of anatomy at the Univ. of Padua. There he produced his chief wo...

Berlin Wall

(Encyclopedia)Berlin Wall, 1961–89, a barrier first erected in Aug., 1961, by the East German government along the border between East and West Berlin, and later along the entire border between East Germany and W...

molybdenum

(Encyclopedia)molybdenum məlĭbˈdənəm [key] [Gr.,=leadlike], metallic chemical element; symbol Mo; at. no. 42; at. wt. 95.96; m.p. about 2,617℃; b.p. about 4,612℃; sp. gr. 10.22 at 20℃; valence +2, +3, +4...

atonality

(Encyclopedia)atonality āˌtōnălˈĭtē [key], in music, systematic avoidance of harmonic or melodic reference to tonal centers (see key). The term is used to designate a method of composition in which the compo...

magnetic resonance

(Encyclopedia)magnetic resonance, in physics and chemistry, phenomenon produced by simultaneously applying a steady magnetic field and electromagnetic radiation (usually radio waves) to a sample of atoms and then a...