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Occupational Safety and Health Administration

(Encyclopedia)Occupational Safety and Health Administration (OSHA), U.S. agency established (1970) in the Dept. of Labor (see Labor, United States Department of) to develop and enforce regulations for the safety an...

Nogales

(Encyclopedia)Nogales nōgäˈlās [key], city (1990 pop. 19,489), Santa Cruz co., S Ariz. on the Mexican border with its adjacent city, Nogales (1990 pop. 105,873), Sonora, NW Mexico. There are copper, silver, and...

arsenopyrite

(Encyclopedia)arsenopyrite mĭsˈpĭkəl [key], silver-white to steel-gray mineral with the metallic luster characteristic of a pyrite. It is a sulfarsenide of iron, FeAsS, crystallizing in the orthorhombic system ...

bunion

(Encyclopedia)bunion, swelling or thickening around the first joint of the big toe. The toe is forced inward and compresses the other toes. The fluid-filled sac, or bursa, in the toe joint becomes inflamed (a condi...

Campbell, Robert, American fur trader and merchant

(Encyclopedia)Campbell, Robert, 1804–79, American fur trader and merchant, one of the mountain men, b. Ireland. He came to the United States c.1824. Having been advised to lead an outdoor life because of a lung a...

Ricasoli, Bettino, Barone

(Encyclopedia)Ricasoli, Bettino, Barone bĕt-tēˈnō bärôˈnā rēkäzôˈlē [key], 1809–80, Italian political leader. An active propagandist for Italian unity, he became (1859) head of the provisional govern...

silver

(Encyclopedia)silver, metallic chemical element; symbol Ag [Lat. argentum]; at. no. 47; at. wt. 107.8682; m.p. 961.93℃; b.p. 2,212℃; sp. gr. 10.5 at 20℃; valence +1 or +2. Pure silver is nearly white, lustrou...

German silver

(Encyclopedia)German silver, name for various alloys of copper, zinc, and nickel, sometimes also containing lead and tin. They were originally named for their silver-white color, but use of the term silver is now p...

Xiang

(Encyclopedia)Xiang shyäng, syäng [key], river, 715 mi (1,151 km) long, rising in NE Guangxi prov. and flowing N through Hunan prov. to Dongting Lake, SE China. The river is navigable to large vessels for most of...

bursa, in anatomy

(Encyclopedia)bursa bûrˈsə [key], closed fibrous sac lined with a smooth membrane, producing a viscous lubricant known as synovial fluid. Bursas are found in regions where muscles or tendons rub against other mu...