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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...

doll

(Encyclopedia)doll, small figure of a human being, usually used as a child's toy. The many types of dolls found among the relics of primitive peoples were cult objects. Egypt, Greece, and Rome have left well-preser...

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 ...

Czartoryski

(Encyclopedia)Czartoryski chärtôrĭsˈkē [key], Polish princely family. Although of ancient lineage, it rose to prominence only in the 17th cent., and in the 18th cent. during the reign of the Saxon kings of Pol...

Chrétien, Jean

(Encyclopedia)Chrétien, Jean (Joseph Jacques Jean Chrétien) zhōsĕfˈ zhäk zhäN krātyăNˈ [key], 1934–, Canadian politician and prime minister (1993–2003), b. Quebec. He received his legal education at Q...

Fish, New York family

(Encyclopedia)Fish, family long prominent in New York politics. Nicholas Fish, 1758–1833, b. New York City. He studied law before serving ably as a major in a New York regiment throughout the American Revolution....

Isherwood, Christopher

(Encyclopedia)Isherwood, Christopher ishˈərwo͝od [key], 1904–86, British-American author. After the appearance of his first novel, All the Conspirators (1928), Isherwood went to Germany. The four years he spen...

Haydn, Franz Joseph

(Encyclopedia)Haydn, Franz Joseph fränts yōˈzĕf hīˈdən [key], 1732–1809, Austrian composer, one of the greatest masters of classical music. As a boy he sang in the choir at St. Stephen's, Vienna, where he ...

Mesozoic era

(Encyclopedia)Mesozoic era mĕzˌəzōˈĭk [key] [Gr.,=middle life], major division of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 65 to 225 million years ago. Great crustal disturb...

New Democratic party

(Encyclopedia)New Democratic party (NDP), Canadian political party, founded in 1961 when the Cooperative Commonwealth Federation (CCF) reorganized itself and entered into close ties with Canadian labor unions, espe...