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Waco

(Encyclopedia)Waco wāˈkō [key], city (1990 pop. 103,590), seat of McLennan co., E central Tex., on the Brazos River, just below the mouth of the Bosque; inc. 1856. It is a rail junction and a trading, shipping, ...

Tours

(Encyclopedia)Tours to͞or [key], city (1990 pop. 133,403), capital of Indre-et-Loire dept., W central France, in Touraine, on the Loire River. It is a wine market and a tourist center, with metallurgical, chemical...

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...

Celsius temperature scale

(Encyclopedia)Celsius temperature scale sĕlˈsēəs [key], temperature scale according to which the temperature difference between the reference temperatures of the freezing and boiling points of water is divided ...

Piltdown man

(Encyclopedia)Piltdown man, name given to human remains found during excavations (1908–15) at Piltdown, Sussex, England, by Charles Dawson. The find led to much speculation and argument. Since they were found wit...

Perth, town, Scotland

(Encyclopedia)Perth, town (1991 pop. 41,916), Perth and Kinross, central Scotland, on the Tay River. It was called St. Johnstoun until the 17th cent. Perth is famous for its dye works and cattle markets. Other indu...

geometry

(Encyclopedia)geometry [Gr.,=earth measuring], branch of mathematics concerned with the properties of and relationships between points, lines, planes, and figures and with generalizations of these concepts. Eucli...

crystal

(Encyclopedia)CE5 Types of crystal crystal, a solid body bounded by natural plane faces that are the external expression of a regular internal arrangement of constituent atoms, molecules, or ions. The formation...

interstellar matter

(Encyclopedia)interstellar matter, matter in a galaxy between the stars, known also as the interstellar medium. The interstellar gas, which constitutes about 99% of the interstellar matter, consists mostly of hyd...

dimension, in mathematics

(Encyclopedia)dimension, in mathematics, number of parameters or coordinates required locally to describe points in a mathematical object (usually geometric in character). For example, the space we inhabit is three...

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