Columbia Encyclopedia

Search results

500 results found

Cedar Falls

(Encyclopedia)Cedar Falls, city (2020 pop. 40,713), Black Hawk co., N Iowa, on the Cedar River; inc. 1854. It developed as a milling center in the late 19th-century a...

West Covina

(Encyclopedia)West Covina, city (1990 pop. 96,086), Los Angeles co., S Calif., in the San Gabriel valley; settled 1905, inc. 1923. Primarily residential, the city has light manufacturing, including power transforme...

laser printer

(Encyclopedia)laser printer, a computer printer that produces high-resolution output by means of a process that is similar to photocopying. In place of reflected light from an image (as is used in xerography), a la...

atrium

(Encyclopedia)atrium āˈtrēəm [key], term for an interior court in Roman domestic architecture and also for a type of entrance court in early Christian churches. The Roman atrium was an unroofed or partially roo...

luminism

(Encyclopedia)luminism lo͞oˈmĭnĭzˌəm [key], American art movement of the 19th cent. Luminism was an outgrowth of the Hudson River school. In its concern for capturing the effects of light and atmosphere it is...

Ashkin, Arthur

(Encyclopedia)Ashkin, Arthur, 1922–2020, American physicist, b. Brooklyn, N.Y., Ph.D. Cornell, 1952. Ashkin worked for four decades at Bell Laboratories, retiring in 1992. Ashkin researched microwaves, nonlinear ...

North Yorkshire

(Encyclopedia)North Yorkshire, county (2011 pop. 598,376), 3,209 sq mi (8,313 sq km), N England. The county comprises the districts of Craven, Hambleton, Harrogate, Richmondshire, Ryedale, Scarborough, and Selby. Y...

operetta

(Encyclopedia)operetta ŏpərĕtˈə [key], type of light opera with a frivolous, sentimental story, often employing parody and satire and containing both spoken dialogue and much light, pleasant music. In the earl...

calcium oxide

(Encyclopedia)calcium oxide, chemical compound, CaO, a colorless, cubic crystalline or white amorphous substance. It is also called lime, quicklime, or caustic lime, but commercial lime often contains impurities, e...

Young, Thomas

(Encyclopedia)Young, Thomas, 1773–1829, English physicist, physician, and Egyptologist. He established (1799) a medical practice in London and was elected (1811) to the staff of St. George's Hospital there. His l...