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Courbet, Gustave

(Encyclopedia)Courbet, Gustave güstävˈ ko͞orbāˈ [key], 1819–77, French painter, b. Ornans. He moved to Paris in 1839 and studied there, learning chiefly by copying masterpieces in the Louvre. An avowed real...

ion, in chemistry

(Encyclopedia)ion, atom or group of atoms having a net electric charge. Ionization has many applications. Vapor lamps and fluorescent lamps take advantage of the light given off when positive ions recombine with ...

cholesterol

(Encyclopedia)CE5 cholesterol kəlĕsˈtərōlˌ [key], fatty lipid found in the body tissues and blood plasma of vertebrates; it is only sparingly soluble in water, but much more soluble in some organic solvent...

Roman art

(Encyclopedia)Roman art, works of art produced in ancient Rome and its far-flung provinces. The continued striving after three-dimensional illusionist effects revealed in the various phases of painting was dup...

forum

(Encyclopedia)forum, market and meeting place in ancient Roman towns in Italy and later in the provinces, corresponding to the Greek agora. By extension the word forum often indicates the meeting itself in modern u...

fireproofing

(Encyclopedia)fireproofing, method of making normally combustible materials as nearly noncombustible as possible. Fireproofing generally applies to textiles and construction materials that are treated with a soluti...

hallucinogenic drug

(Encyclopedia)hallucinogenic drug həlo͞oˌsənōjĕnˈĭk [key], any of a group of substances that alter consciousness; also called psychotomimetic (i.e., mimicking psychosis), mind-expanding, or psychedelic drug...

poliomyelitis

(Encyclopedia)poliomyelitis pōˌlēōmīˌəlīˈtĭs [key], polio, or infantile paralysis, acute viral infection, mainly of children but also affecting older persons. Historically, there were three immunologic ty...

Kabul

(Encyclopedia)Kabul käˈbo͝ol, kəbo͞olˈ [key], city (1997 est. pop. 1,500,000), capital of Afghanistan and of Kabul prov. and its largest city and economic and cultural center, E Afghanistan, on the Kabul Rive...

decimal system

(Encyclopedia)decimal system [Lat.,=of tenths], numeration system based on powers of 10. A number is written as a row of digits, with each position in the row corresponding to a certain power of 10. A decimal point...