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threonine

(Encyclopedia)CE5 threonine thrēˈənēn [key], organic compound, one of the 22 α-amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian protein. It is one of several essen...

totem

(Encyclopedia)totem tōˈtəm [key], an object, usually an animal or plant (or all animals or plants of that species), that is revered by members of a particular social group because of a mystical or ritual relatio...

rose window

(Encyclopedia)CE5 Rose window (Cathedral of Notre-Dame, Paris) rose window, large, stone-traceried, circular window of medieval churches. Romanesque churches of both England and the Continent had made use of th...

polyhedron

(Encyclopedia)CE5 Polyhedrons polyhedron pŏlˌēhēˈdrən [key], closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squar...

equilibrium

(Encyclopedia)CE5 Equilibrium equilibrium, state of balance. When a body or a system is in equilibrium, there is no net tendency to change. In mechanics, equilibrium has to do with the forces acting on a body. ...

centripetal force and centrifugal force

(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...

Cuvier, Georges Léopold Chrétien Frédéric Dagobert, Baron

(Encyclopedia)Cuvier, Georges Léopold Chrétien Frédéric Dagobert, Baron zhôrzh lāôpôldˈ krātyăNˈ frādārēkˈ dägôbĕrˈ bärôNˈ küvyāˈ [key], 1769–1832, French naturalist, b. Montbéliard, st...

Notre-Dame de Paris

(Encyclopedia)Notre-Dame de Paris nôˈtrə-däm də pärēˈ [key] [Fr.,=Our Lady of Paris], cathedral church of Paris, a noble achievement of early Gothic architecture in France. It stands upon the Île de la Cit...

Wyler, William

(Encyclopedia)Wyler, William, 1902–1981, American film director, producer, and writer, b. Mülhausen, Germany (now Mulhouse, France) as Willi Wilder. He came to the United States (1920) at the invitation of Carl ...

Bingham, Hiram, 1875–1956, American archaeologist, historian, and statesman

(Encyclopedia)Bingham, Hiram, 1875–1956, American archaeologist, historian, and statesman, b. Honolulu; son of Hiram Bingham (1831–1908). He was educated at Yale (B.A., 1898), the Univ. of California (M.A., 190...