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Perugia

(Encyclopedia)Perugia pāro͞oˈjä [key], city (1991 pop. 144,732), capital of Umbria and of Perugia prov., central Italy, situated on a hill overlooking the valley of the Tiber River. It is a commercial, industri...

espionage

(Encyclopedia)espionage ĕsˈpēənäzhˌ [key], the act of obtaining information clandestinely. The term applies particularly to the act of collecting military, industrial, and political data about one nation for ...

xenon

(Encyclopedia)xenon zēˈnŏn [key] [Gr.,=strange], gaseous chemical element; symbol Xe; at. no. 54; at. wt. 131.293; m.p. −111.9℃; b.p. −107.1℃; density 5.86 grams per liter at STP; valence usually 0. Xeno...

Pynchon, Thomas

(Encyclopedia)Pynchon, Thomas pĭnˈchən [key], 1937–, American novelist, b. Glen Cove, N.Y., grad. Cornell, 1958. Pynchon is noted for his amazingly fertile imagination, his wild sense of humor, and the teeming...

cloud chamber

(Encyclopedia)cloud chamber, device used to detect elementary particles and other ionizing radiation. A cloud chamber consists essentially of a closed container filled with a supersaturated vapor, e.g., water in ai...

gills, in biology

(Encyclopedia)CE5 Gills of a fish: Side view (A) and ventral view (B) gills, external respiratory organs of most aquatic animals. In fishes the gills are located in gill chambers at the rear of the mouth (phary...

foraminiferan

(Encyclopedia)foraminiferan fərămˌənĭfˈərən [key], common name for members of the class Foraminifera, large, shelled ameboid protozoans belonging to the phylum Sarcodina. Most foraminiferan shells are calca...

astronaut

(Encyclopedia)astronaut, crew member on a U.S. manned spaceflight mission; the Soviet term is cosmonaut. Candidates for manned spaceflight are carefully screened to meet the highest physical and mental standards, a...

sulfuric acid

(Encyclopedia)sulfuric acid, chemical compound, H2SO4, colorless, odorless, extremely corrosive, oily liquid. It is sometimes called oil of vitriol. Although sulfuric acid is now one of the most widely used c...

Nixon, Richard Milhous

(Encyclopedia)Nixon, Richard Milhous, 1913–94, 37th President of the United States (1969–74), b. Yorba Linda, Calif. Soon after his reelection Nixon's popularity plummeted as the growing revelations of the Wa...