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birthwort

(Encyclopedia)birthwort bûrthˈwûrt, –wôrt [key], common name for the Aristolochiaceae, a family of shrubs and woody climbing vines found in the tropics and other warm regions. The largest genus, Aristolochia,...

tachyon

(Encyclopedia)tachyon tăkˈēŏnˌ [key], hypothetical elementary particle that travels only at speeds exceeding that of light. According to the theory of relativity, the speed of light is the limiting velocity fo...

requiem

(Encyclopedia)requiem rĕkˈwēəm, rēˈ–, rāˈ– [key] [Lat.,=rest], proper Mass for the souls of the dead, performed on All Souls' Day and at funerals. The reformation of Roman Catholic liturgy following the...

jet propulsion

(Encyclopedia)CE5 Types of jet engines: In the propeller-driven turbine a stream of high-velocity gases provides the power to drive the turbine and turn the propeller. In the jet-driven turbine the stream of gas...

Clark, Alvan

(Encyclopedia)Clark, Alvan, 1804–87, American astronomer and maker of astronomical lenses, b. Ashfield, Mass. In 1846 the firm of Alvan Clark & Sons was established at Cambridgeport, Mass.; it became famous a...

Davis, Benjamin Oliver, Jr.

(Encyclopedia)Davis, Benjamin Oliver, Jr., 1912–2002, American air force general, b. Washington, D.C.; son of Benjamin Oliver Davis. After studying at Western Reserve and Chicago universities, he attended West Po...

Moreno Valley

(Encyclopedia)Moreno Valley mərēˈnō [key], city (1990 pop. 118,779), Riverside co., S Calif., inc. 1984. In 1990, Moreno Valley was California's fastest-growing city, with a population increase of more than 300...

basic oxygen process

(Encyclopedia)basic oxygen process, method of producing steel from a charge consisting mostly of pig iron. The charge is placed in a furnace similar to the one used in the Bessemer process of steelmaking except tha...

Dacron

(Encyclopedia)Dacron dāˈkrŏn, dăkˈrŏn [key], trademark for a polyester fiber. Dacron is a condensation polymer obtained from ethylene glycol and terephthalic acid. Its properties include high tensile strength...

hay, livestock fodder

(Encyclopedia)hay, wild or cultivated plants, chiefly grasses and legumes, mown and dried for use as livestock fodder. Hay is an important factor in cattle raising and is one of the leading crops of the United Stat...