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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...

communicable diseases

(Encyclopedia)communicable diseases, illnesses caused by microorganisms and transmitted from an infected person or animal to another person or animal. Some diseases are passed on by direct or indirect contact with ...

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...

series

(Encyclopedia)series, in mathematics, indicated sum of a sequence of terms. A series may be finite or infinite. A finite series contains a definite number of terms whose sum can be found by various methods. An infi...

Sharif, Nawaz

(Encyclopedia)Sharif, Nawaz näwäzˈ shärēfˈ [key], 1949–, Pakistani politician; grad. Government College, Lahore; Punjab Univ. Law College. Born into a prominent Lahore business family, he was by 1980 direct...

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...

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 ...

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...

will, in law

(Encyclopedia)will, in law, document expressing the wishes of a person (known as a testator) concerning the disposition of her property after her death. If a person dies intestate, i.e., without a valid will, statu...