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spear

(Encyclopedia)spear, primitive weapon consisting of a wooden shaft tipped with a sharp point, usually 8 to 9 ft (2.4–2.7 m) in length. The point may be carved from the shaft and hardened in a fire, or made from a...

Torstensson, Lennart

(Encyclopedia)Torstensson, Lennart lĕnˈnärt tōrˈstənsōn [key], 1603–51, Swedish general in the Thirty Years War. He was one of the generals trained by Gustavus II in the new techniques of war. As commander...

racquets

(Encyclopedia)racquets, game played by two or four persons on a court 60 by 30 ft (18.3 m by 9.1 m); it is surrounded by three walls 30 ft (9.1 m) high and a backwall 15 ft (4.6 m) high. The ball, 1 in. (2.54 cm) i...

Shapley, Lloyd Stowell

(Encyclopedia)Shapley, Lloyd Stowell shăpˈlē [key], 1923–2016, American mathematician and economist, b. Cambridge, Mass., Ph.D Princeton, 1953; son of Harlow Shapley. He worked at the RAND Corp. from 1954 to 1...

Shekinah

(Encyclopedia)Shekinah shēkīˈnə [key] [Heb.,=dwelling, presence], in Judaism, term used in the Targum (Aramaic translation of the Hebrew Bible) and elsewhere to indicate the manifestation of the presence of God...

Perseus, in Greek mythology

(Encyclopedia)Perseus pûrˈsēəs, –so͝os [key], in Greek mythology, son of Zeus and Danaë. His grandfather, Acrisius, had been warned by an oracle that his grandson would kill him and therefore put Perseus an...

petal

(Encyclopedia)petal, one of the four basic parts of a flower, next innermost organ from the sepal. The whorl of petals is known collectively as the corolla [Lat.,=little crown]. The number of petals is usually cons...

Defoe, Daniel

(Encyclopedia)Defoe or De Foe, Daniel dĭfōˈ [key], 1660?–1731, English writer, b. London. He was nearly sixty when he turned to writing novels. In 1719 he published his famous Life and Strange Surprising Adv...

engineering

(Encyclopedia)engineering, profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life. Until the Industrial Revolution there were only t...

analytic geometry

(Encyclopedia)analytic geometry, branch of geometry in which points are represented with respect to a coordinate system, such as Cartesian coordinates, and in which the approach to geometric problems is primarily a...