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roller

(Encyclopedia)roller, common name for brightly colored Old World birds noted for performing somersaults in flight. They include the rollers proper (subfamily Coraciinae) and ground rollers (subfamily Brachypteracii...

Pisano, Nicola

(Encyclopedia)Pisano, Nicola pēzäˈnō [key], b. c.1220, d. between 1278 and 1287, major Italian sculptor, believed to have come from Apulia. He founded a new school of sculpture in Italy. His first great work w...

Ravenna, city, Italy

(Encyclopedia)Ravenna rävĕnˈnä [key], city (1991 pop. 135,844), capital of Ravenna prov., in Emilia-Romagna, N central Italy, near the Adriatic Sea (with which it is connected by a canal). It is an agricultural...

red shift

(Encyclopedia)red shift or redshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect...

Rainey, Gertrude "Ma"

(Encyclopedia)Rainey, Gertrude "Ma," 1886–1939, African-American blues singer and songwriter, b. Columbus, Ga., as Gertrude Melissa Nix Pridgett. Rainey's place and...

psychosomatic medicine

(Encyclopedia)psychosomatic medicine sīˌkōsōmătˈĭk [key], study and treatment of those emotional disturbances that are manifested as physical disorders. The term psychosomatic emphasizes essential unity of t...

sponge

(Encyclopedia)sponge, common name for members of the aquatic animal phylum Porifera, and for the dried, processed skeletons of certain species used to hold water. Over 4,500 living species are known; they are found...

technetium

(Encyclopedia)technetium tĕknēˈshēəm [key] [Gr. technetos=artificial], artificially produced radioactive chemical element; symbol Tc; at. no. 43; mass no. of most stable isotope 98; m.p. 2,200℃; b.p. 4,877�...

cave

(Encyclopedia)cave, a cavity in the earth's surface usually large enough for a person to enter. Caves may be formed by the chemical and mechanical action of a stream upon soluble or soft rock, of rainwater seeping ...

Vesta, in astronomy

(Encyclopedia)Vesta vĕsˈtə [key], in astronomy, the fourth asteroid to be discovered. It was found in 1807 by H. Olbers. It is the third largest asteroid in size, with a diameter of c.326 mi (525 km). Its averag...