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diffraction

(Encyclopedia)diffraction, bending of waves around the edge of an obstacle. When light strikes an opaque body, for instance, a shadow forms on the side of the body that is shielded from the light source. Ordinarily...

executive order

(Encyclopedia)executive order, in the United States, official document initiated and signed by the president containing directives concerning how the executive branch shall carry out its responsibilities under the ...

executors and administrators

(Encyclopedia)executors and administrators. An executor is the person designated in the will of a deceased person to carry out the provisions of the will. An administrator is the person appointed by a probate court...

Granger movement

(Encyclopedia)Granger movement, American agrarian movement taking its name from the National Grange of the Patrons of Husbandry, an organization founded in 1867 by Oliver H. Kelley and six associates. Its local uni...

typewriter

(Encyclopedia)typewriter, instrument for producing by manual operation characters similar to those of printing. Corresponding to each key on the instrument's keyboard is a steel type. Activated through a series of ...

Poison Affair

(Encyclopedia)Poison Affair, in French history, scandal implicating a number of prominent persons at the court of King Louis XIV. It began with the trial of Marie Madeleine d'Aubray, marquise de Brinvilliers (c.163...

orangutan

(Encyclopedia)orangutan ōrăngˈo͝otăn [key], an ape of the genus Pongo, found in rain forests of Borneo and Sumatra. Highly specialized for arboreal life, orangutans usually travel by grasping branches with han...

Flynn, Michael Thomas

(Encyclopedia)Flynn, Michael Thomas, 1958–, U.S. military officer and government official, b. Middletown, R.I., Univ. of Rhode Island (B.S., 1981). Commissioned as ...

herpes simplex

(Encyclopedia)herpes simplex hûrˈpēz [key], an acute viral infection of the skin characterized by one or more painful, itching blisters filled with clear fluid. It is caused by either of two herpes simplex virus...

Hirst, Damien Steven

(Encyclopedia)Hirst, Damien Steven, 1965–, British artist-provacateur, b. Bristol. While at Goldsmiths College, London (grad. 1988), he organized the exhibition Freeze, whose participants, led by Hirst, became kn...