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molecular weight

(Encyclopedia)molecular weight, weight of a molecule of a substance expressed in atomic mass units (amu). The molecular weight may be calculated from the molecular formula of the substance; it is the sum of the ato...

Rossetti, Dante Gabriel

(Encyclopedia)Rossetti, Dante Gabriel rōsĕtˈē [key], 1828–82, English poet and painter; son of Gabriele Rossetti and brother of Christina Rossetti. He attended the Royal Academy and studied painting briefly ...

Reform Acts

(Encyclopedia)Reform Acts or Reform Bills, in British history, name given to three major measures that liberalized representation in Parliament in the 19th cent. Representation of the counties and boroughs in the H...

impressionism, in painting

(Encyclopedia)impressionism, in painting, late-19th-century French school that was generally characterized by the attempt to depict transitory visual impressions, often painted directly from nature, and by the use ...

council, ecumenical

(Encyclopedia)council, ecumenical ĕkˌyo͞omĕnˈĭkəl [key] [Gr.,=universal], in Christendom, council of church leaders, the decisions of which are accepted by some segment of the church as authoritative, also c...

cigar and cigarette

(Encyclopedia)cigar and cigarette, tubular rolls of tobacco designed for smoking. Cigars consist of filler leaves held together by binder leaves and covered with a wrapper leaf, which is rolled spirally around the ...

Disney, Walt

(Encyclopedia)Disney, Walt (Walter Elias Disney) dĭzˈnē [key], 1901–66, American movie producer and pioneer in animated cartoons, b. Chicago. He grew up in Missouri, in the small town of Marceline and in Kansa...

herbal medicine

(Encyclopedia)herbal medicine, use of natural plant substances (botanicals) to treat and prevent illness. The practice has existed since prehistoric times and flourishes today as the primary form of medicine for pe...

electromagnetic radiation

(Encyclopedia)CE5 Electromagnetic spectrum electromagnetic radiation, energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if ...

Hawthorne, Nathaniel

(Encyclopedia)Hawthorne, Nathaniel, 1804–64, American novelist and short-story writer, b. Salem, Mass., one of the great masters of American fiction. His novels and tales are penetrating explorations of moral and...