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mineral

(Encyclopedia)mineral, inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form. A few of the mi...

Magellanic Clouds

(Encyclopedia)Magellanic Clouds măjˌəlănˈĭk [key], two dwarf galaxies located in the far southern sky and visible to the unaided eye; they are classified as irregular because they show no definite symmetry or...

Saint-Denis, city, France

(Encyclopedia)Saint-Denis săN-dənēˈ [key], city (1990 pop. 90,806), Seine–Saint-Denis dept., N central France. It is an industrial suburb N of Paris. Metals, chemicals, machinery, electronics, and food produc...

Albertus Magnus, Saint

(Encyclopedia)Albertus Magnus, Saint ălbûrˈtəs măgˈnəs [key], or Saint Albert the Great, b. 1193 or 1206, d. 1280, scholastic philosopher, Doctor of the Church, called the Universal Doctor. A nobleman of Bol...

Chattanooga

(Encyclopedia)Chattanooga chătˌəno͞oˈgə [key], city (2020 pop. 181,099), seat of Hamilton co., E Tenn., on both ...

Grenoble

(Encyclopedia)Grenoble grənôˈblə [key], city, capital of Isère dept., SE France, at the foot of the Al...

Alexandria, cities, United States

(Encyclopedia)Alexandria. 1 City (2020 pop. 45,275), seat of Rapides parish, central La., on the Red River; inc. 1818. It is a trade, rail, and medical center for a rich agricultural and timber area. ...

ultrasonics

(Encyclopedia)ultrasonics, study and application of the energy of sound waves vibrating at frequencies greater than 20,000 cycles per second, i.e., beyond the range of human hearing. The application of sound energy...

palladium, chemical element

(Encyclopedia)palladium [Gr. Pallas, goddess of wisdom], metallic chemical element; symbol Pd; at. no. 46; at. wt. 106.42; m.p. 1,554℃; b.p. 2,970℃; sp. gr. 12.02 at 20℃; valence +2, +3, or +4. Palladium is a...

Paterson

(Encyclopedia)Paterson, city (1990 pop. 140,891), seat of Passaic co., NE N.J., at the falls of the Passaic River; inc. 1851. Founded in 1791 by Alexander Hamilton and others of the Society for Establishing Useful ...