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isobar

(Encyclopedia)isobar īˌsəbărˈĭk [key], line drawn on a weather map through points of equal atmospheric pressure. Isobars are used to define cyclones (low-pressure regions) and anticyclones (high-pressure regi...

infinity

(Encyclopedia)infinity, in mathematics, that which is not finite; it is often indicated by the symbol ∞. A sequence of numbers, a1, a2, a3, … , is said to “approach infinity” if the numbers eventually b...

squash racquets

(Encyclopedia)squash racquets or squash, game played on a four-walled court, 16 ft (4.88 m) high by 181⁄2 ft (5.64 m) wide by 32 ft (9.75 m) long. The back wall, shorter than the front wall, usually measures 9 ft...

Pacific Ocean

(Encyclopedia)CE5 Pacific Ocean, largest and deepest ocean, c.70,000,000 sq mi (181,300,000 sq km), occupying about one third of the earth's surface; named by the explorer Ferdinand Magellan; the southern part i...

Shotwell, James Thomson

(Encyclopedia)Shotwell, James Thomson, 1874–1965, Canadian-American historian, b. Strathroy, Ont. A teacher of history at Columbia from 1900 and professor from 1908 to 1942, Shotwell also worked tirelessly to pro...

ray, in physics

(Encyclopedia)ray, in physics, term denoting the straight line along which light or other form of radiation is propagated from its source. It generally refers to the line of propagation of waves but is also applied...

Karan, Donna

(Encyclopedia)Karan, Donna, 1948–, American fashion designer, b. Forest Hills, N.Y., as Donna Faske. Daughter of a tailor and a garment saleswoman, she started to design clothes as a teenager and studied at New Y...

spirit level

(Encyclopedia)spirit level, tool for determining whether a surface is horizontal. It consists essentially of a slightly bent transparent tube that is held in a frame. The tube contains some alcohol, ether, or simil...

Bassiouni, M. Cherif

(Encyclopedia)Bassiouni, M. Cherif (Mahmoud Cherif Bassiouni), 1937–2017, Egyptian-American international criminal law jurist and human-rights advocate, b. Cairo. Bassiouni fought for Egypt in the Suez conflict (...

Nippur

(Encyclopedia)Nippur nĭpo͝orˈ [key], ancient city of Babylonia, a N Sumerian settlement on the Euphrates. It was the seat of the important cult of the god Enlil, or Bel. Excavations at Nippur have yielded the re...