| | - ordinary portland cement
- (from the article "cement") Five types of portland cement are standardized in the United States by the American Society for Testing and Materials (ASTM): ordinary (Type I), modified (Type II), high-early-strength (Type III), low-heat (Type IV), and sulfate-resistant (Type V). In other countries Type II is omitted, and Type III is called rapid-hardening. Type ...
- ordinary ray
- (from the article "double refraction") ...is split into two rays, each traveling in a different direction. One ray (called the extraordinary ray) is bent, or refracted, at an angle as it travels through the medium; the other ray (called the ordinary ray) passes through the medium unchanged.
- ordination
- in Christian churches, a rite for the dedication and commissioning of ministers. The essential ceremony consists of the laying of hands of the ordaining minister upon the head of the one being ordained, with prayer for the gifts of the Holy Spirit and of grace required for the carrying out ... [14 Related Articles]
- Ordnance Manual of 1862
- (from the article "rocket and missile system") ...they were not particularly successful. Rockets were used in a limited way in the American Civil War (1861-65), but reports are fragmentary, and apparently they were not decisive. The U.S. Ordnance Manual of 1862 lists 16-pound Hale rockets with a range of 1.25 miles.
- Ordnance Survey
- (from the article "map") ...beyond the means of private cartographers who had theretofore provided for most map needs. Originally exclusively military, national survey organizations gradually became civilian in character. The Ordnance Survey of Britain, the Institut Geographique National of France, and the Landestopographie of Switzerland are examples.
- Ordnung
- (from the article "Amish") Humility, family, community, and separation from the world are the mainstays of the Amish. Everyday life and custom are governed by an unwritten code of behaviour called the Ordnung, and shunning (Meidung) remains an integral way in which the community deals with disobedient members. In formal religious doctrine, the Amish ...
- Ordonez, Antonio
- Spanish matador, generally considered to be the first-ranked bullfighter of the 1950s and '60s. [1 Related Articles]
- Ordonez, Bartolome
- sculptor who was one of the originators of the Spanish school of Renaissance sculpture. Influenced by the masters of the Italian Renaissance, he evolved his own pure style, which was widely imitated after his early death.
- Ordonez, Magglio
- (from the article "Baseball") Magglio Ordonez of the Tigers won the AL batting title with a .363 average; Holliday won the NL title with .340. Alex Rodriguez of the Yankees collected the most home runs (54) and runs batted in (RBIs; 156) in the AL, earning the regular-season MVP honours. In the NL, Prince ...
- Ordonnance Cabochienne
- (from the article "Caboche, Simon") ...of the time. Caboche himself led a mob that besieged and took the Bastille in April 1413. The next month Charles VI issued a major ordinance for administrative reform that became known as the Ordonnance Cabochienne, named for Caboche, which provided for the control of affairs by the deliberations of ...
- Ordonnance Civile
- (from the article "procedural law") ...was a tendency to create "nationalized" versions of the general Roman-canonical procedure prevalent in much of Europe. In 1667 in France this led to the enactment by Louis XIV of the Ordonnance Civile, also known as Code Louis, a comprehensive code regulating civil procedure in all of France in a ...
- Ordono I
- (from the article "Kings and queens regnant of Spain") ...it was governed by the municipal corporation of Lena, but since that time it has been an independent administrative entity. The parish church of San Juan, originally established by a grant of King Ordono I of Asturias in AD 857, has Romanesque columns and capitals. Cattle raising and forestry were ...
- Ordono II
- (from the article "'Abd al-Rahman III") Meanwhile, 'Abd al-Rahman also had to check threats from the Christian north. The main danger came from the kingdom of Leon. An expedition commanded by Ordono II, then vassal king of Galicia and later king of Leon, into Muslim territory in the summer of 913, especially his sack of Evora ...
- Ordono IV
- (from the article "Kings and queens regnant of Spain") After succeeding his brother, Ordono II, Sancho was overthrown by a revolt of his nobles and replaced by his cousin Ordono IV. Sancho sought help from the Umayyad caliph 'Abd ar-Rahman III, who helped him regain his throne in 960.
- Ordos Plateau
- plateau in the southern section of the Inner Mongolia Autonomous Region, northern China. The Ordos fills the area inside the great northern bend of the Huang He (Yellow River) and is bounded by the borders of Shaanxi province and of the Hui Autonomous Region of Ningxia, a frontier that follows ... [1 Related Articles]
- Ordosian tradition
- (from the article "Stone Age") ...Upper Paleolithic sites are known in the provinces of Shansi, Shensi, and northern Kansu, in the region encompassed by the great bend of the Yellow River (Huang Ho). Collectively known as the Ordosian, these materials are of Upper Pleistocene age. Typical of the Ordosian are blade implements of various types, ...
- Ordovices
- (from the article "United Kingdom") ...on by Caratacus, however, caused Scapula to occupy the lowlands beyond the Fosse Way up to the River Severn and to move forward his forces into this area for the struggle with the Silures and Ordovices. The Roman forces were strengthened by the addition of Legion XX, released for this ...
- Ordovician Period
- in geologic time, the second period of the Paleozoic Era. It began 488.3 million years ago, following the Cambrian Period, and ended 443.7 million years ago, when the Silurian Period began. Ordovician rocks have the distinction of occurring at the highest elevation on Earth-the top of Mount Everest. [6 Related Articles]
- Ordovician radiation
- (from the article "Ordovician Period") Ordovician radiation
- Ordre des Avocats
- (from the article "legal profession") ...such a position, but by the time of the principate it was their legal eminence that made them respected. The English serjeants lived magnificently, especially in Elizabethan times, and the French Ordre des Avocats was established (14th century) by feudal aristocrats in circumstances reminiscent of early Rome-including an insistence on ...
- Ordu
- city and port, northern Turkey, on the Black Sea. It lies at the mouth of the Melet River on the eastern slopes of Boztepe (1,800 feet [550 metres]), which protects it against storms from the northwest. Ordu was the site of ancient Cotyora, founded by Greek colonists from Sinope (modern ...
- Ordyn-Nashchokin, Afanasy Lavrentyevich
- statesman and diplomat who became the chief adviser on foreign affairs to Tsar Alexis of Russia (ruled 1645-76).
- Ordzhonikidze, Grigory Konstantinovich
- communist leader who played a major role in bringing Georgia under Soviet rule and in industrializing the Soviet Union. [1 Related Articles]
- ore
- a natural aggregation of one or more minerals that can be mined, processed, and sold at a profit. An older definition restricted usage of the word ore to metallic mineral deposits, but the term has expanded in some instances to include nonmetallics. [7 Related Articles]
- ore deposit
- (from the article "mineral deposit") ...level of concentration and the size of the deposit, that must be reached if the deposit is to be worked at a profit. A mineral deposit that is sufficiently rich to be worked at a profit is called an ore deposit, and in an ore deposit the assemblage of ore ...
- ore development
- (from the article "mining") The openings made in the process of extracting ore are called stopes or rooms. There are two steps involved in stoping. The first is development-that is, preparing the ore blocks for mining-and the second is production, or stoping, itself. Ore development is generally much more expensive on a per-ton basis ...
- ore mineral
- (from the article "mineral deposit") Certain kinds of mineral can be smelted more readily than others; these are commonly referred to as ore minerals. Ore minerals tend to be concentrated in small, localized rock masses that form as a result of special geologic processes, and such local concentrations are called mineral deposits. Mineral deposits are ...
- Ore Mountains
- range of hills bounding the Bohemian Massif, extending 100 miles (160 km) along the German-Czech border, and reaching an average width of 25 miles (40 km). The Bohemian (southeastern) side of the range has a steep scarp face (2,000 to 2,500 feet [600 to 750 metres] high in places); the ... [5 Related Articles]
- ore pass
- (from the article "mining") Ore that is mined on the different levels is dumped into vertical or near-vertical openings called ore passes, through which it falls by gravity to the lowest level in the mine. There it is crushed, stored in an ore bin, and charged into skips at a skip-filling station. In the ...
- ore reserve
- (from the article "mining") ...important to keep profit in mind. The total quantity of mineral in a given deposit is referred to as the mineral inventory, but only that quantity which can be mined at a profit is termed the ore reserve. As the selling price of the mineral rises or the extraction costs ...
- Oread
- (from the article "nymph") ...of nature with which they were connected. The Oceanids, for example, were sea nymphs; the Nereids inhabited both saltwater and freshwater; the Naiads presided over springs, rivers, and lakes. The Oreads (oros, "mountain") were nymphs of mountains and grottoes; the Napaeae (nape, "dell") and the Alseids (alsos, "grove") were nymphs ...
- Oreaster reticulatus
- (from the article "sea star") ...throughout the Northern Hemisphere have longer, more pointed, spine-fringed arms; among these genera are Astropecten, Psilaster, and Luidia. The largest West Indies sea star, Oreaster reticulatus, is sometimes 50 cm (20 inches) across. Members of the chiefly Indo-Pacific genus Linckia can grow a new individual from a small piece of ...
- Orebro
- lan (county) of south-central Sweden. It extends from the Bergslagen mining region in the north to Lake Hjalmar in the east and Lake Vatter in the south. It comprises the traditional landskap (province) of Narke and parts of those of Vastmanland and Varmland. The lan has a number of lakes ...
- Orebro
- town and capital of Orebro lan (county), south-central Sweden. Orebro lies along the Svartan River at its entrance into Lake Hjalmar. One of Sweden's oldest towns, it was already a commercial centre in the 13th century and played a prominent part in Swedish history. Orebro was the residence of Engelbrekt ...
- oregano
- flavourful dried leaves and flowering tops of any of various perennial herbs of the mint family (Lamiaceae, or Labiatae), particularly Origanum vulgare, called wild marjoram in northern and central Europe, widely used to season many foods. The name is derived from the Greek oros, "mountain," and ganos, "joy." Oregano has ... [1 Related Articles]
- Oregon
- constituent state of the United States of America. To the north of the state's 97,073 square miles (251,419 square kilometres) of land and inland water lies Washington, from which Oregon receives the waters of the Columbia River; to the east, Idaho, more than half of the border with which is ... [18 Related Articles]
- Oregon
- city, seat (1836) of Ogle county, northern Illinois, U.S. It lies on the Rock River, about 95 miles (155 km) west of Chicago. Early inhabitants of the region included Potawatomi and Winnebago Indians. It was founded in 1833 by John Phelps, a sawmiller. Oregon's economy is based largely on agriculture ...
- Oregon ash
- (from the article "ash") ...the handles of shovels, spades, hoes, rakes, and other agricultural tools. The black ash (F. nigra) of eastern North America, the blue ash (F. quadrangulata) of the Midwest, and the Oregon ash (F. latifolia) of the Pacific Northwest furnish wood of comparable quality that is used for furniture, interior paneling, ...
- Oregon Ballet Theatre
- (from the article "Performing Arts") ...at Houston Ballet. As the year proceeded, the Tchaikovsky Ballet from Perm, Russia, toured the U.S. with its recently acquired staging by ballerina Natalia Makarova, and Christopher Stowell gave his Oregon Ballet Theatre its first complete staging of the ballet in June. Kevin McKenzie's generally pretty production of the work ...
- Oregon Caves National Monument
- cave complex in the Siskiyou Mountains of southwestern Oregon, U.S., near the California border. Established in 1909, the monument occupies a surface area of 0.8 square mile (2 square km). It consists of a single cave comprising a series of chambers joined by subterranean corridors on four levels.
- Oregon City
- city, seat (1843) of Clackamas county, northwestern Oregon, U.S., at Willamette Falls (40 feet [12 metres] high) and the juncture of the Clackamas and Willamette rivers. It forms part of a tri-city complex, just southeast of Portland, that includes Gladstone and West Linn. In 1829-30 John McLoughlin of the Hudson's ...
- Oregon Country
- (from the article "Idaho") ...in Oregon country, which was claimed first by Spain and then by Russia, Great Britain, and the United States; after the latter two had settled on the 49th parallel as the northern U.S. border, the Oregon Territory was created in 1848. It included the present state of Idaho, as well ...
- Oregon crab
- (from the article "crab apple") ...crab (M. baccata), Toringo crab (M. sieboldii), and Japanese crab (M. floribunda). Among the notable American species are the garland, or wild sweet crab (M. coronaria); Oregon crab (M. fusca); prairie, or Iowa crab (M. ioensis); and southern crab (M. angustifolia).
- Oregon grape
- any of several species of the genus Mahonia, evergreen shrubs of the barberry family (Berberidaceae) grown for their ornamental value. M. aquifolium, the typical Oregon grape, is 90 cm (3 feet) or more tall and is native to the Pacific coast of North America. It is most used for its ...
- Oregon Health and Science University
- public, coeducational institution of higher learning in Portland, Oregon, U.S. It is specifically dedicated to biomedical research and patient medical care and to training health professionals, scientists, and engineers. The university comprises schools of medicine, dentistry, and nursing, and the OGI School of Science and Engineering, located in nearby Hillsboro. ...
- Oregon maple
- (from the article "maple") Large maples, usually in excess of 30 metres high, that are much planted for shade include the sugar (A. saccharum), silver (A. saccharinum), and red (A. rubrum) maples. The Oregon, or bigleaf, maple (A. macrophyllum) provides commercially valuable wood darker than that of other maples; it shows bright-orange fall foliage. ...
- Oregon Question
- (from the article "Buchanan, James") ...and subsequent Mexican War took place during Buchanan's tenure as secretary of state. Buchanan's role in the war was limited, but he played a more active part in the border dispute with Britain over Oregon. Despite the 1844 campaign slogan of "Fifty-four forty or fight," the matter was settled peaceably ...
- Oregon Shakespeare Festival
- (from the article "Performing Arts") Also in the regions, news was made by the appointment of a new artistic director for the flagship Oregon Shakespeare Festival in Ashland. Pathbreaking director Bill Rauch, who cofounded the community-focused Cornerstone Theater Company in Los Angeles and led it for 20 years, assumed the reins of the repertory powerhouse, ...
- Oregon State University
- public, coeducational institution of higher learning in Corvallis, Oregon, U.S. It is a comprehensive research university with land-, sea-, and space-grant status and awards undergraduate, graduate, and professional degrees. The university comprises a graduate school, an honours college, an interdisciplinary studies program, and colleges of forestry, oceanic and atmospheric sciences, ...
- Oregon swallowtail butterfly
- (from the article "community ecology") ...on plants in the carrot family Apiaceae (also called Umbelliferae), with different populations feeding on different plant species. However, one species within this group, the Oregon swallowtail (Papilio oregonius), has become specialized to feed on tarragon sagebrush (Artemisia dracunculus), which is in the plant family Asteracaea (Compositae of some sources). ...
- Oregon System
- (from the article "Oregon") The state constitution was adopted in 1857. Oregon has been in the vanguard of several innovative movements in U.S. government collectively known as the Oregon System. In 1902 the concepts of initiative and referendum were introduced, by which voters are able to initiate and vote upon statutes or constitutional revisions; ...
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