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lamp

(Encyclopedia)lamp, originally a vessel for holding oil or some combustible substance that could be burned through a wick for illumination; the term has been extended to other lighting devices. Stones, shells, and ...

Sommer, William

(Encyclopedia)Sommer, William, 1867–1949, American painter and lithographer, b. Detroit. He was apprenticed as a lithographer and studied drawing with Julius Melchers in Detroit and drawing and painting in Munich...

Strauss, Levi

(Encyclopedia)Strauss, Levi, 1829–1902, American merchant, b. Buttenheim, Germany, as Löb Strauss. He moved with his mother and sisters to New York City in 1847 to join his brothers' wholesale dry-goods company....

molybdenite

(Encyclopedia)molybdenite məlĭbˈdənīt, mō– [key], a mineral, molybdenum disulfide, MoS2, blue-gray in color, with a metallic luster and greasy feel. It occurs in crystals of the hexagonal system but more co...

Riley, Bridget

(Encyclopedia)Riley, Bridget, 1931–, English painter. Associated with the pop art movement, Riley covers large canvases with interlocking bands, undulating curves, scattered discs, or repeated squares or triangle...

apatite

(Encyclopedia)apatite ăpˈətīt [key], mineral, a phosphate of calcium containing chlorine or fluorine, or both, that is transparent to opaque in shades of green, brown, yellow, white, red, and purple. Apatite is...

heartwood

(Encyclopedia)heartwood, the central, woody core of a tree, no longer serving for the conduction of water and dissolved minerals; heartwood is usually denser and darker in color than the outer sapwood. Before the s...

Field, Eugene

(Encyclopedia)Field, Eugene, 1850–95, American poet and journalist, b. St. Louis. After working on several Midwestern newspapers, in 1883 he became a columnist for the Chicago Daily News (later the Record). His u...

bird-of-paradise flower

(Encyclopedia)bird-of-paradise flower, large tropical herb (Strelitzia reginae) of the family Musaceae (banana family), native to S Africa. Its large blue and orange blossom resembles an exotic bird; it is cultivat...

birthmark

(Encyclopedia)birthmark, pigmented maldevelopment of the skin that varies in size, either present at birth or developing later. Birthmarks may appear as moles (melanocytic nevi) that vary in color from light brown ...