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Hilda, Saint

(Encyclopedia)Hilda, Saint, 614–80, English abbess of Whitby, princess of Northumbria. She became a Christian at the age of 13 and a nun at 33. About 647 she set out for a convent in France, but was recalled by S...

mandolin

(Encyclopedia)mandolin mănˌdəlĭnˈ, mănˈdəlĭnˌ [key], musical instrument of the lute family, with a half-pear-shaped body, a fretted neck, and a variable number of strings, plucked with the fingers or with...

liquefied petroleum gas

(Encyclopedia)liquefied petroleum gas or LPG, mixture of gases, chiefly propane and butane, produced commercially from petroleum and stored under pressure to keep it in a liquid state. The boiling point of liquefie...

polyester

(Encyclopedia)polyester, synthetic fiber, produced by the polymerization of the product formed when an alcohol and organic acid react. The outstanding characteristic of polyesters is their ability to resist wrinkli...

polystyrene

(Encyclopedia)polystyrene pŏlˌēstīˈrēn [key], widely used plastic; it is a polymer of styrene. Polystyrene is a colorless, transparent thermoplastic that softens slightly above 100℃ (212℉) and becomes a v...

carnauba

(Encyclopedia)carnauba kärnôˈbə, –nouˈ– [key], wax obtained from the wax palm, or carnauba (Copernicia cerifera), of Brazil. It is secreted by the leaves, apparently in defense against the hot winds and dr...

Van de Graaff, Robert Jemison

(Encyclopedia)Van de Graaff, Robert Jemison văn də gräf [key], 1901–67, American physicist, b. Tuscaloosa, Ala., grad. Univ. of Alabama (B.S., 1922), Ph.D. Oxford, 1928. He was research associate at Massachuse...

Brookhaven National Laboratory

(Encyclopedia)Brookhaven National Laboratory, scientific research center, at Upton (town of Brookhaven), Long Island, N.Y. It was founded in 1947 by Associated Universities, a management corporation sponsored by ni...

praseodymium

(Encyclopedia)praseodymium prāˌzēōdĭmˈēəm, –sēō– [key] [Gr., =green twin], metallic chemical element; symbol Pr; at. no. 59; at. wt. 140.90765; m.p. 931℃; b.p. 3,512℃; sp. gr. about 6.8; valence +...

Colorado, University of

(Encyclopedia)Colorado, University of, main campus at Boulder; state supported; coeducational; chartered 1861, opened 1877. There are campuses at Colorado Springs and Denver; the main medical campus is at Aurora. T...