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pitchblende

(Encyclopedia)pitchblende pĭchˈblĕndˌ [key], dark, lustrous, heavy mineral, a source of radium and uranium. Largely natural uranium oxides, triuranium octaoxide (U3O8) and uranium dioxide (UO2), it usually cont...

Wildsmith, Brian Lawrence

(Encyclopedia)Wildsmith, Brian Lawrence, 1930–2016, English children's book author and illustrator. He attended the Slade School of Fine Art, University College London (1949–52), and served in the army before b...

hysteria

(Encyclopedia)hysteria hĭstĕrˈēə [key], in psychology, a disorder commonly known today as conversion disorder, in which a psychological conflict is converted into a bodily disturbance. It is distinguished from...

Crawford, Ralston

(Encyclopedia)Crawford, Ralston, 1906–78, American painter, b. St. Catherine's, Ont. Crawford's paintings are marked by precise detail, flat color, and the simplification of form. His works portray the American c...

Robinson, Theodore

(Encyclopedia)Robinson, Theodore, 1852–96, American painter, b. Irasburg, Vt. Beginning his career as a realist, Robinson was profoundly influenced by his meeting with Monet in 1888. Translating the impressionist...

Eggleston, William

(Encyclopedia)Eggleston, William (William Joseph Eggleston, Jr.), 1939–, American photographer credited with establishing color photography as an art form, b. Memphis Tenn. His early work in black and white was i...

Goes, Hugo van der

(Encyclopedia)Goes, Hugo van der ho͞oˈgō vän dĕr go͞os [key], d.1482, Flemish painter. Probably born in Ghent, he was a member of the painters' guild there in 1467 and became dean of the guild in 1474, a year...

opal

(Encyclopedia)opal ōˈpəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO2·nH2O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is usually colorless...

Callahan, Harry Morey

(Encyclopedia)Callahan, Harry Morey, 1912–99, American photographer, b. Detroit. Self-taught, he began taking pictures (1938) as a hobby and, inspired by the work of Ansel Adams, began to produce professional-qua...

Cassatt, Mary

(Encyclopedia)Cassatt, Mary kəsătˈ [key], 1844–1926, American figure painter and etcher, b. Pittsburgh. Most of her life was spent in France, where she was greatly influenced by her great French contemporaries...