military officer and lover of Catherine II, empress of Russia from 1762 to 1796. He organized the coup d'etat that placed Catherine on the Russian throne and subsequently was her ...
Augustinian canon, author of an early Middle English book of metrical homilies on the Gospels, to which he gave the title Ormulum, "because Orm made it." The work (dated on ...
chartered city, western Leyte, Philippines. The city lies at the head of Ormoc Bay, an inlet of the Camotes Sea. It serves the only commercial sugarcane district in the eastern ...
(from French dorure d'or moulu: "gilding with gold paste"), gold-coloured alloy of copper, zinc, and sometimes tin, in various proportions but usually containing at least 50 percent copper. Ormolu is ...
city, Volusia county, northeastern Florida, U.S. It lies on the Atlantic Ocean and the Halifax River (a lagoon separated from the Atlantic by barrier beaches), adjacent to Daytona Beach to ...
Anglo-Irish Protestant who was the leading agent of English royal authority in Ireland during much of the period from the beginning of the English Civil War to the Glorious Revolution ...
in architecture, any element added to an otherwise merely structural form, usually for purposes of decoration or embellishment. Three basic and fairly distinct categories of ornament in architecture may be ...
in music, the embellishment of a melody, either by adding notes or by modifying rhythms. In European music, ornamentation is added to an already complete composition in order to make ...
river, Basse-Normandie region, northern France. It is 94 miles (152 km) long and flows through Orne and Calvados departements to empty into the English Channel 8 miles (13 km) north-northeast ...
any member of the large taxonomic group of herbivorous dinosaurs comprising Triceratops and all dinosaurs more closely related to it than to birds. The ornithischians (meaning "bird-hipped") are one of ...
genus of plants in the family Liliaceae, consisting of about 100 species of bulbous herbs, native to Eurasia and Africa. The leaves are grouped at the base of the plant, ...
small, lightly built carnivorous dinosaur found as fossils from the Late Jurassic Period (159 million to 144 million years old) in North America. Ornitholestes is known from a nearly complete ...
a branch of zoology dealing with the study of birds. Most of the early writings on birds are more anecdotal than scientific, but they represent a broad foundation of knowledge, ...
ostrichlike dinosaurs found as fossils in Mongolian, European, and North American deposits dating from 65 million to 125 million years ago (Early and Late Cretaceous periods).
any member of the group of ornithischian dinosaurs characterized by a two-legged (bipedal) stance, from which the group's name, meaning "bird-foot," is derived.
city in the lan (county) of Vasternorrland, northern Sweden, on the Gulf of Bothnia. It was founded in 1842. In 1892 the railroad arrived, and the next year Ornskoldsvik received ...
mountain-building event, generally one that occurs in geosynclinal areas. In contrast to epeirogeny, an orogeny tends to occur during a relatively short time in linear belts and results in intensive ...
rain, snow, or other precipitation produced when moist air is lifted as it moves over a mountain range. As the air rises and cools, orographic clouds form and serve as ...
one of the two largest ethnolinguistic groups of Ethiopia, constituting nearly one-third of the population and speaking a language of the Cushitic branch of the Afro-Asiatic (formerly Hamito-Semitic) family. Originally ...
town, Akwa Ibom state, southeastern Nigeria. It lies at the mouth of the Cross River and is the terminus of roads from Uyo and Opobo. Oron is a coastal trade ...
town, Penobscot county, east-central Maine, U.S. It lies along the Penobscot River 8 miles (13 km) northeast of Bangor. Settled about 1775, it was known as Deadwater and Stillwater Plantation ...
river in southwestern Asia, draining a large part of the northern Levant into the Mediterranean Sea. From its source in Al-Biqa' (i.e., the Bekaa Valley) of central Lebanon, the river ...
any of several bird species of the blackbird family (Icteridae) that are common to the canopy of New World tropical forests and known (along with the caciques) for their hanging ...
city, northwestern Mindanao, Philippines. The city fronts on Iligan Bay (east) and the Bohol (Mindanao) Sea (northeast). It was a municipality until designated a city in 1969. Oroquieta is an ...
city, seat (1856) of Butte county, north-central California, U.S. It lies along the Feather River, in the Sacramento Valley, at the foot of the Sierra Nevada, about 75 miles (120 ...
earth-fill dam on the Feather River, California, U.S. Completed by the state of California in 1968, it is the highest dam in the United States and one of the highest ...
ancient Greek legendary hero endowed with superhuman musical skills. He became the patron of a religious movement based on sacred writings said to be his own.
in the visual arts, an artistic trend derived from Cubist painting that gave priority to colour. The movement was named in 1912 by the French poet Guillaume Apollinaire.
highly elaborate embroidery work, or a piece of such embroidery. More specifically orphrey is an ornamental border, or embroidered band, especially as used on ecclesiastical vestments. Orphreys often utilized cloth ...
the transparent yellow mineral arsenic sulfide (As2S3), formed as a hot-springs deposit, an alteration product (especially from realgar), or as a low-temperature product in hydrothermal veins. It is found in ...
fine 20th-century glass produced by a glasshouse at Orrefors in the south of Sweden. In 1916 and 1917 the Orrefors glasshouse hired the painters Simon Gate and Edvard Hald, respectively, ...
mechanical model of the solar system used to demonstrate the motions of the planets about the Sun, probably invented by George Graham (d. 1751) under the patronage of Charles Boyle, ...
yellowish, semisolid, fragrant essential oil obtained from the roots of the Florentine iris (Iris florentina) and used as a flavouring agent, in perfume, and medicinally. The use of orris oil ...
French economist whose broad financial and governmental reforms in early 18th-century Spain helped to further the implementation of centralized and uniform administration in that country.
museum of Paris, France. It is housed in the former Orsay Railway Station (Gare d'Orsay), a large, ornate structure built in the Beaux Arts style and completed in 1900; it ...
city, Vitebsk oblast (province), east-central Belarus. It lies about 60 miles (100 km) southwest of Smolensk on the Dnieper River. First mentioned in 1067, it has always been a major ...
one of the oldest, most illustrious, and for centuries most powerful of the Roman princely families. Their origins, when stripped of legend, can be traced back to a certain Ursus ...
city, Orenburg oblast (province), western Russia. It lies about 150 miles (240 km) south of Magnitogorsk at the confluence of the Ural and Or rivers. It was founded in 1735 ...
Danish physicist and chemist who discovered that electric current in a wire can deflect a magnetized compass needle, a phenomenon the importance of which was rapidly recognized and which inspired ...
lake in Novara and Verbano-Cusio-Ossola provincie, Piemonte (Piedmont) regione, northwestern Italy, just west of Lake Maggiore, from which it is divided by Mount Mottarone. About 8 miles (13 km) long ...
Nicaraguan guerrilla leader, member of the Sandinista junta that took power in 1979, and from November 1984 to April 1990 the elected president of Nicaragua.
Flemish cartographer and dealer in maps, books, and antiquities, who published the first modern atlas, Theatrum orbis terrarum (1570; Epitome of the Theater of the Worlde).
common alkali feldspar mineral, a potassium aluminosilicate (KAlSi3O8); it usually occurs as variously coloured, frequently twinned crystals in granite. Orthoclase is used in the manufacture of glass and ceramics; occasionally, ...
division of dentistry dealing with the prevention and correction of irregularities of the teeth-generally entailing the straightening of crooked teeth or the correcting of a poor bite, or malocclusion (physiologically ...
(from Greek orthodoxos, "of the right opinion"), true doctrine and its adherents as opposed to heterodox or heretical doctrines and their adherents. The word was first used in early 4th-century ...
ecclesiastically independent, or autocephalous, church of the Eastern Orthodox communion, recognized as such by its mother church in Russia; it adopted its present name on April 10, 1970.
Eastern Orthodox church, recognized as the second state church of Finland. Most of the Orthodox Finns were originally from Karelia, the southeastern part of Finland that was annexed by the ...
ecclesiastically independent member of the Eastern Orthodox communion, established in 1924 to accommodate the 4,000,000 Orthodox Christians residing in the vast Ukrainian and Byelorussian territories acquired by Poland after World ...
official federation of Jewish Orthodox synagogues in the United States and Canada; its counterpart organization for rabbis is the Rabbinical Council of America.
the religion of those Jews who adhere most strictly to traditional beliefs and practices. Jewish Orthodoxy resolutely refuses to accept the position of Reform Judaism that the Bible and other ...
in Russian history, slogan created in 1832 by Count Sergey S. Uvarov, minister of education 1833-49, that came to represent the official ideology of the imperial government of Nicholas I ...
feast celebrated on the first Sunday of Lent by the Eastern Orthodox Church and Eastern Catholics of the Byzantine Rite to commemorate the return of icons (sacred images) to the ...
theory that successive members of an evolutionary series become increasingly modified in a single undeviating direction. That evolution frequently proceeds in orthogenetic fashion is undeniable, though many striking features developed ...
family of curves that intersect another family of curves at right angles (see ). Such families of mutually orthogonal curves occur in such branches of physics as electrostatics, in which ...
