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personal computer

(Encyclopedia)personal computer (PC), small but powerful computer primarily used in an office or home without the need to be connected to a larger computer. PCs evolved after the development of the microprocessor m...

Palau

(Encyclopedia)Palau pälouˈ [key], officially Republic of Palau, independent nation (2015 est. pop. 21,000), c.192 sq mi (497 sq km), W Pacific, in the W Caroline Islands. Belau, the indigenous name for Palau, is ...

piano

(Encyclopedia)piano or pianoforte, musical instrument whose sound is produced by vibrating strings struck by felt hammers that are controlled from a keyboard. The piano's earliest predecessor was the dulcimer. The ...

ophthalmoscope

(Encyclopedia)ophthalmoscope ŏfthălˈməskōpˌ [key], instrument used for examining the inner structure of the eye. The device was invented by the German physiologist H. L. F. von Helmholtz in 1851. His model co...

Kentucky and Virginia Resolutions

(Encyclopedia)Kentucky and Virginia Resolutions, in U.S. history, resolutions passed in opposition to the Alien and Sedition Acts, which were enacted by the Federalists in 1798. The Jeffersonian Republicans first r...

Gourlay, Robert Fleming

(Encyclopedia)Gourlay, Robert Fleming go͝orˈlē [key], 1778–1863, Scottish writer and agitator, b. Fifeshire. He emigrated to Upper Canada (Ontario) in 1817 and at Kingston attempted to establish himself as a l...

Rajoelina, Andry

(Encyclopedia)Rajoelina, Andry änˈdrē räjōēlēnˈä [key], 1974–, Malagasy businessman and politician. Rajoelina was a popular disc jockey and built a successful media conglomerate. Elected mayor of Antanan...

encyclopedia

(Encyclopedia)encyclopedia, compendium of knowledge, either general (attempting to cover all fields) or specialized (aiming to be comprehensive in a particular field). The modern type of encyclopedia—with alpha...

cobaltite

(Encyclopedia)cobaltite kōˈbôltīt, kōbôlˈtīt [key], opaque, silver-white, sometimes reddish or grayish mineral of the pyrite group, a compound of cobalt, arsenic, and sulfur, CoAsS. It occurs in crystals of...

Thomson, Peter William

(Encyclopedia)Thomson, Peter William, 1929–2018, Australian golfer. A leading player in European tournaments at a time when Australians had not yet emerged as top golfers, Thomson had a compact swing and efficien...