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Jakobson, Roman

(Encyclopedia)Jakobson, Roman rəmänˈ yäkˈôbsən [key], 1896–1982, Russian-American linguist and literary critic, b. Moscow. He coined the term structural linguistics and stressed that the aim of historical ...

norovirus

(Encyclopedia)norovirus or Norwalk virus, highly contagious viral disease caused by infection with an RNA virus of the genus Norovirus. The virus causes acute gastroenteritis, usually one to two days after infectio...

pruning

(Encyclopedia)pruning, the horticultural practice of cutting away an unwanted, unnecessary, or undesirable plant part, used most often on trees, shrubs, hedges, and woody vines. Man uses pruning to remove diseased ...

perversion, sexual

(Encyclopedia)perversion, sexual, in psychology, sexual behavior deemed pathological by its deviation from “normal” sexual desire. The definition of sexual perversion has shifted considerably over time: indeed,...

optometry

(Encyclopedia)optometry ŏptŏmˈətrē [key], eye-care specialty concerned with eye examination, determination of visual abilities, diagnosis of eye diseases and conditions, and the prescription of lenses and othe...

photography, still

(Encyclopedia)photography, still, science and art of making permanent images on light-sensitive materials. See also photographic processing; motion picture photography; motion pictures. By the end of ...

Hindenburg, Paul von

(Encyclopedia)Hindenburg, Paul von hĭnˈdənbûrg, Ger. poul fən hĭnˈdənbo͝ork [key], 1847–1934, German field marshal and president (1925–34), b. Poznan (then in Prussia). His full name was Paul Ludwig Ha...

dew

(Encyclopedia)dew, thin film of water that has condensed on the surface of objects near the ground. Dew forms when radiational cooling of these objects during the nighttime hours also cools the shallow layer of ove...

Allston, Washington

(Encyclopedia)Allston, Washington ôlˈstən [key], 1779–1843, American painter and author, b. Georgetown co., S.C. After graduating from Harvard (1800), where he composed music and wrote poetry (published in 181...

Comnenus

(Encyclopedia)Comnenus kŏmnēˈnəs [key], family name of several Byzantine emperors—Isaac I, Alexius I, John II, Manuel I, Alexius II, and Andronicus I—who reigned in the 11th and 12th cent., and of the histo...