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silicon carbide

(Encyclopedia)silicon carbide, chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an abrasive, it is marketed under su...

Sioux City

(Encyclopedia)Sioux City, city (1990 pop. 80,505), seat of Woodbury co., NW Iowa, at the junction of the Big Sioux and Floyd rivers with the Missouri; inc. 1857. It is a shipping, wholesale trade, and industrial ce...

Siemens, Sir William

(Encyclopedia)Siemens, Sir William, 1823–83, English electrical engineer, b. Germany; brother of Ernst Werner von Siemens. Originally his name was Carl Wilhelm Siemens. After visiting England to introduce an elec...

carbide

(Encyclopedia)carbide, any one of a group of compounds that contain carbon and one other element that is either a metal, boron, or silicon. Generally, a carbide is prepared by heating a metal, metal oxide, or metal...

quinidine

(Encyclopedia)quinidine kwĭnˈĭdēnˌ [key], heart muscle relaxant used to maintain regular heart rhythm patterns. It is an alkaloid chemically similar to quinine and, like quinine, occurs naturally in some speci...

Securities and Exchange Commission

(Encyclopedia)Securities and Exchange Commission (SEC), agency of the U.S. government created by the Securities Exchange Act of 1934 and charged with protecting the interests of the public and investors in connecti...

DeGeneres, Ellen Lee

(Encyclopedia) DeGeneres, Ellen Lee, 1958- , American actor and talk-show host, b. Metairie, La. DeGeneres’s parents split in 1974, and she subsequently ...

Henry, Joseph

(Encyclopedia)Henry, Joseph, 1797–1878, American physicist, b. Albany, N.Y., educated at Albany Academy. He taught (1826–32) mathematics and natural philosophy at Albany Academy and was professor of natural phi...

Noyce, Robert Norton

(Encyclopedia)Noyce, Robert Norton nois [key], 1927–90, American engineer, inventor, and entrepeneur, b. Burlington, Iowa.; grad. Grinnell College (B.A., 1949), Massachusetts Institute of Technology (Ph.D., 1953)...

krypton

(Encyclopedia)krypton krĭpˈtŏn [key] [Gr.,=hidden], gaseous chemical element; symbol Kr; at. no. 36; at. wt. 83.798; m.p. −156.6℃; b.p. −152.3℃; density 3.73 grams per liter at STP; valence usually 0. Kr...