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electrodynamics

(Encyclopedia)electrodynamics, study of phenomena associated with charged bodies in motion and varying electric and magnetic fields (see charge; electricity); since a moving charge produces a magnetic field, electr...

hairdressing

(Encyclopedia)hairdressing, arranging of the hair for decorative, ceremonial, or symbolic reasons. Primitive men plastered their hair with clay and tied trophies and badges into it to represent their feats and qual...

joint, in anatomy

(Encyclopedia)joint, in anatomy, juncture between two bones. Some joints are immovable, e.g., those that connect the bones of the skull, which are separated merely by short, tough fibers of cartilage. Movable joint...

Washington, Denzel

(Encyclopedia) Washington, Denzel (Denzel Hayes Washington Jr.), 1954- , African-American actor, b. Mount Vernon, N.Y., Fordham Univ. (B.A., 1977). Washington’s fa...

centrifuge

(Encyclopedia)centrifuge sĕnˈtrəfyo͞oj [key], device using centrifugal force to separate two or more substances of different density, e.g., two liquids or a liquid and a solid. The centrifuge consists of a fixe...

directing

(Encyclopedia)directing, the art of leading dramatic performances on the stage or in films. The modern theatrical director is in complete charge of all the artistic aspects of a dramatic presentation. It is the dir...

satellite, natural

(Encyclopedia)satellite, natural, celestial body orbiting a planet, dwarf planet, asteroid, or star of a larger size. The most familiar natural satellite is the earth's moon; thus, satellites of other planets are o...

futurism

(Encyclopedia)futurism, Italian school of painting, sculpture, and literature that flourished from 1909, when Filippo Tommaso Marinetti's first manifesto of futurism appeared, until the end of World War I. Carlo Ca...

amplifier

(Encyclopedia)amplifier, device that accepts a varying input signal and produces an output signal that varies in the same way as the input but has a larger amplitude. The input signal may be a current, a voltage, a...

Calatrava, Santiago

(Encyclopedia)Calatrava, Santiago, 1951–, Spanish architect, grad. Institute of Architecture, Valencia (1974), Federal Institute of Technology, Zürich (Ph.D., 1981). He opened an architectural and engineering pr...