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  • deglaciation (climatology)

    Antarctica: Glaciation: …Ice Sheet may have undergone deglaciations perhaps similar to those that occurred later during interglacial stages in the Northern Hemisphere. Evidence of former higher sea levels found in many areas of the Earth seems to support the hypothesis that such deglaciation occurred. If Antarctica’s ice were to melt today, for…

  • Deglane, Henri (French architect)

    Western architecture: France: …Exposition of 1889, for which Henri Deglane and Victor Laloux erected, respectively, the Grand Palais and the Gare d’Orsay (renovated as the Musée d’Orsay, 1979–86). These monumental buildings are in a frothy Baroque style, though they incorporate much glass and iron. Reaction to this exuberance was expressed in the work…

  • deglutition (physiology)

    Swallowing, the act of passing food from the mouth, by way of the pharynx (or throat) and esophagus, to the stomach. Three stages are involved in swallowing food. The first begins in the mouth. There, food is mixed with saliva for lubrication and placed on the back of the tongue. The mouth c

  • dégorgement (wine making)

    champagne: …removed in a process called dégorgement. In this process, the cork is carefully pried off, allowing the internal pressure in the bottle to shoot the sediment out; this is sometimes done after the neck of the bottle and the deposits have been frozen. After dégorgement, a small amount of syrup…

  • degradation (geology)

    Chhattisgarh: Relief: …topographic variations resulting from extensive denudation (wearing away of the earth by such processes as weathering and erosion). Knolls, undulating interfluves (areas between adjacent watercourses), and valleys flanked by belts of clayey soils are characteristic of the region. About 100 miles (160 km) wide, the Chhattisgarh Plain is bounded by…

  • degradation (chemistry)

    surface coating: Exterior durability: …are susceptible to damage and degradation by continued exposure to sunlight. Degradation occurs because radiation in the near-ultraviolet and blue end of the visible spectrum contains sufficient energy to break chemical bonds within polymers of many types. As radiation-induced degradation occurs, the ability of a coating to provide chemical and…

  • degradation (biology)

    soap and detergent: Raw materials: …and, because the foam retards biological degradation of organic material in sewage, it caused problems in sewage-water regeneration systems. In countries where sewage water is used for irrigation, the foam was also a problem. Intensive research in the 1960s led to changes in the alkylbenzene sulfonate molecules. The tetrapropylene, which…

  • degradation theory (religious evolution)

    animism: Tylor’s theory of animism: …he championed against the so-called degradation theory, which held that the religion of remote peoples could only have spread to them from centres of high culture, such as early Egypt, becoming “degraded” in the process of transfer. Tylor showed that animistic beliefs exhibit great variety and often are uniquely suited…

  • degraded chernozem (soil)

    Europe: Soils: …less value are known as degraded chernozems and gray forest soils. At best, chestnut soils—some needing only water to be productive—and, at worst, solonetzic (highly saline) soils cover areas of increasing aridity eastward of Ukraine to the Ural River. Lastly, in southern Europe, where the countryside is fragmented by mountains,…

  • degranulation (biology)

    blood: Neutrophils: …the neutrophil are depleted (degranulation). A metabolic process within the granules produces hydrogen peroxide and a highly active form of oxygen (superoxide), which destroy the ingested bacteria. Final digestion of the invading organism is accomplished by enzymes.

  • Degré zéro de l’écriture, Le (work by Barthes)

    Roland Barthes: His first book, Le Degré zéro de l’écriture (1953; Writing Degree Zero), was a literary manifesto that examined the arbitrariness of the constructs of language. In subsequent books—including Mythologies (1957), Essais critiques (1964; Critical Essays), and La Tour Eiffel (1964; The Eiffel Tower and Other Mythologies)—he applied the…

  • degree (of an angle)

    trigonometry: Trigonometric functions: …most common units are the degree and the radian. There are 360° in a complete revolution, with each degree further divided into 60′ (minutes) and each minute divided into 60″ (seconds). In theoretical work, the radian is the most convenient unit. It is the angle at the centre of a…

  • degree (title of academic achievement)

    Degree, in education, any of several titles conferred by colleges and universities to indicate the completion of a course of study or the extent of academic achievement. The hierarchy of degrees dates back to the universities of 13th-century Europe, which had faculties organized into guilds.

  • degree (of a function)

    formal logic: Special systems of LPC: …of n arguments (or, of degree n) when there is a rule that specifies a unique object (called the value of the function) whenever all the arguments are specified. In the domain of human beings, for example, “the mother of —” is a monadic function (a function of one argument),…

  • degree (law)

    criminal law: Degrees of participation: The common-law tradition distinguishes four degrees of participation in crime. One who commits the act “with his own hand” is a principal in the first degree. His counterpart in French law is the auteur (literally, “author”), or coauteur when two or more…

  • degree (of an equation)

    mathematics: Theory of equations: …of second-, third-, and fourth-degree equations and investigated why these solutions failed when the degree was greater than or equal to five. He introduced the novel idea of considering functions of the roots and examining the values they assumed as the roots were permuted. He was able to show…

  • degree (of a vertex)

    graph theory: …with each vertex is its degree, which is defined as the number of edges that enter or exit from it. Thus, a loop contributes 2 to the degree of its vertex. For instance, the vertices of the simple graph shown in the diagram all have a degree of 2, whereas…

  • degree day (agriculture)

    agricultural technology: The degree day: One weather characteristic of agricultural value is the degree day. This concept holds that the growth of a plant is dependent on the total amount of heat to which it is subjected during its lifetime, accumulated as degree days. Common practice is to…

  • Degrees (work by Butor)

    Michel Butor: Degrés (1960; Degrees), his fourth novel, imposes on the action the rigid pattern of a college timetable.

  • DeGregory v. New Hampshire Attorney General (law case)

    legislative investigative powers: ” Later, in DeGregory v. New Hampshire Attorney General (1966), the court held that the First Amendment prevents the government from “using the power to investigate enforced by the contempt power,” in the absence of any showing of “overriding and compelling state interest that would warrant intrusion into…

  • Degrelle, Léon (Belgian politician)

    Léon Degrelle, founder and leader of the Rexist Party of Belgium, who collaborated with the Germans during World War II. After failing three times to pass his final law exams at the Catholic University of Leuven (Louvain), Degrelle, who was a dynamic orator, entered politics. Using banking scandals

  • Degrelle, Léon Joseph Marie (Belgian politician)

    Léon Degrelle, founder and leader of the Rexist Party of Belgium, who collaborated with the Germans during World War II. After failing three times to pass his final law exams at the Catholic University of Leuven (Louvain), Degrelle, who was a dynamic orator, entered politics. Using banking scandals

  • Degrés (work by Butor)

    Michel Butor: Degrés (1960; Degrees), his fourth novel, imposes on the action the rigid pattern of a college timetable.

  • Degtyarev, Vasily (Russian inventor)

    small arm: The submachine gun: After the war, Vasily Degtyarev of the Soviet Union incorporated Schmeisser’s principles into his own designs, culminating in the Pistolet Pulemyot Degtyarova of 1940. The PPD was fed by a drum-shaped magazine containing 71 7.62-mm cartridges, and it fired at a rate of 900 rounds per minute—far too…

  • Degtyarov-Shpagin Krupnokaliberny 1938 (weapon)

    small arm: Large-calibre machine guns: …the Degtyarov-Shpagin Krupnokaliberny 1938 (DShK-38), was similar, but it was gas-operated. It went into wide use in Soviet-supplied countries. Both of these weapons, as well as their successors (such as the Soviets’ Nikitin-Sokolov-Volkov, or NSV, machine gun), were used by infantry units on wheeled or tripod mounts, but they…

  • degu (rodent)

    Degu, (genus Octodon), one of four species of ratlike South American rodents found primarily on the lower western slopes of the Andes Mountains. It is one of the most common mammals of central Chile at elevations up to 1,200 metres (3,900 feet), where it prefers open grassy areas near shrubs,

  • Deguchi Nao (Japanese religious leader)

    ōmoto: …transmitted through a peasant woman, Deguchi Nao, whose healing powers attracted an early following. Her first revelation in 1892 foretold the destruction of the world and the appearance of a messiah who would usher in the new heaven on earth.

  • Deguchi Onisaburō (Japanese religious leader)

    ōmoto: …and organized by her son-in-law, Deguchi Onisaburō (1871–1948), who denounced armament and war and identified himself as the leader who would establish the new order. He attracted more than 2,000,000 believers in the 1930s but aroused the hostility of the government, which twice, in 1921 and again in 1935, arrested…

  • degumming (food processing)

    fat and oil processing: Water refining: Water refining, usually called degumming, consists of treating the natural oil with a small amount of water, followed by centrifugal separation. The process is applied to many oils that contain phospholipids in significant amounts. Since the separated phospholipids are rather waxy or gummy solids, the term degumming was quite…

  • Deh! vieni alla finestra (work by Mozart)

    serenade: …music is the serenade “Deh! vieni alla finestra” (“Oh, Come to the Window”), from Wolfgang Amadeus Mozart’s Don Giovanni. The instrumental serenade gradually lost its association with courtship and became (about 1770) primarily a collection of light pieces such as dances and marches suitable for open-air, evening performance.

  • Dehaene, Jean-Luc (prime minister of Belgium)

    Jean-Luc Joseph Marie Dehaene, Belgian politician (born Aug. 7, 1940, Montpellier, France—died May 15, 2014, Brittany, France), as premier of Belgium (1992–99) held together a four-party coalition of French- and Flemish-language constituents and in 1993 completed a series of constitutional reforms

  • Dehaene, Jean-Luc Joseph Marie (prime minister of Belgium)

    Jean-Luc Joseph Marie Dehaene, Belgian politician (born Aug. 7, 1940, Montpellier, France—died May 15, 2014, Brittany, France), as premier of Belgium (1992–99) held together a four-party coalition of French- and Flemish-language constituents and in 1993 completed a series of constitutional reforms

  • dehalogenation (chemistry)

    elimination reaction: …the reaction is known as dehalogenation. Similarly, the elimination of a water molecule, usually from an alcohol, is known as dehydration; when both leaving atoms are hydrogen atoms, the reaction is known as dehydrogenation. Elimination reactions are also classified as E1 or E2, depending on the reaction kinetics. In an…

  • dehesa (agroforestry)

    forestry: Range and forage: …agroforestry, a practice known as silvopasture, or dehesa, specifically seeks to combine trees with forage (pasture) and livestock production. The components are structurally and functionally combined and actively managed to optimize the positive biophysical interactions between them. This form of agroforestry is a practical and low-cost means of implementing integrated…

  • dehiscence (botany)

    Fabales: Characteristic morphological features: …that generally splits open (dehisces) along one or both edges (sutures) at maturity, releasing the seeds that have developed from the ovules. This basic legume type is idealized in a pea or bean pod, which bears two rows of marginally placed ovules along the upper suture. But evolution within…

  • Dehiwala–Mount Lavinia (Sri Lanka)

    Dehiwala–Mount Lavinia, urban area on the southwestern coast of Sri Lanka. The area lies south of Colombo, of which it is a residential suburb. It comprises Dehiwala, Galkissa, Mount Lavinia, and other communities, all governed by a single urban council. Mount Lavinia is a seaside resort known for

  • Dehmel, Richard (German poet)

    Richard Dehmel, German poet who exerted a major influence on young writers through his innovations in form and content. After completing his studies at Berlin and Leipzig in 1887, Dehmel worked as an insurance official and then, in 1895, became a freelance writer. He chose naturalistic social

  • Dehmelt, Hans Georg (American physicist)

    Hans Georg Dehmelt, German-born American physicist who shared one-half of the Nobel Prize for Physics in 1989 with the German physicist Wolfgang Paul. (The other half of the prize was awarded to the American physicist Norman Foster Ramsey.) Dehmelt received his share of the prize for his

  • Dehn’s lemma (mathematical theory)

    Max Dehn: …on topological manifolds, known as Dehn’s lemma.

  • Dehn, Max (German mathematician)

    Max Dehn, German mathematician and educator whose study of topology in 1910 led to his theorem on topological manifolds, known as Dehn’s lemma. Dehn was educated in Germany and received his doctorate from the University of G?ttingen in 1900. He was influenced by the German mathematician David

  • Dehn, Paul (British playwright, screenwriter, and lyricist)
  • Dehon, Léon-Gustave (Roman Catholic priest)

    Léon-Gustave Dehon, French Roman Catholic priest who founded the Congregation of the Priests of the Sacred Heart of Jesus, a congregation of priests and brothers dedicated to spreading the apostolate of the Sacred Heart. Educated at the Sorbonne, Dehon was ordained priest in 1868 at Rome. After

  • Dehra Dun (India)

    Dehra Dun, city, capital of Uttarakhand state, northern India. It lies in the northwestern part of the state in the foothills of the Himalayas at an elevation of about 2,200 feet (670 metres). Dehra Dun was founded in 1699, when the heretical Sikh Guru Ram Rai was driven out of the Punjab and built

  • Dehri (India)

    Dehri, city, southwestern Bihar state, northeastern India. It lies on the Son River, about 10 miles (16 km) east of Sasaram. Dehri has major road and rail connections and houses railway workshops. The city is the headworks of the Son canal system and the site of a hydroelectric dam. Industries

  • Dehua porcelain (Chinese art)

    Dehua porcelain, Chinese porcelain made at Dehua in Fujian province. Although the kiln began production some time during the Song period (960–1279), most examples of the porcelain are attributed to the Ming dynasty (1368–1644). The characteristic product of Dehua was the white porcelain known to

  • Dehumanization of Art, The (work by Ortega y Gasset)

    Spanish literature: Novecentismo: …La deshumanización del arte (1925; The Dehumanization of Art), which analyzed contemporary “depersonalized” (i.e., nonrepresentational) art. Ramón Pérez de Ayala made the novel a polished art form and a forum for philosophical discussion. Belarmino y Apolonio (1921; Belarmino and Apolonio) examines the age-old debate between faith and reason, utilizing symbolic…

  • dehumidifier (device)

    home appliance: Appliances for comfort.: …in uncomfortably humid rooms, the dehumidifier was developed, using air-conditioning technology: room air is propelled by fan across a cooling coil on which moisture condenses and then drops into a container; the dried air is then warmed and circulated. Conversely, air whose relative humidity is too low for comfort can…

  • dehydration (food preservation)

    Dehydration, in food processing, means by which many types of food can be preserved for indefinite periods by extracting the moisture, thereby inhibiting the growth of microorganisms. Dehydration is one of the oldest methods of food preservation and was used by prehistoric peoples in sun-drying

  • dehydration (physics and chemistry)

    duricrust: Factors involved in duricrust formation: …that are capable of promoting dehydration and hardening of ferricrusts, whether before, during, or after stripping of the overlying soil, include the destruction of forest and lowering of the water table, both of which can occur in several ways. Aside from clearance by humans, forest destruction, for example, may be…

  • dehydration (physiology)

    Dehydration, loss of water from the body; it is almost invariably associated with some loss of salt (sodium chloride) as well. The treatment of any form of dehydration, therefore, requires not only the replacement of the water lost from the body but also the restoration of the normal concentration

  • dehydration reaction (chemistry)

    metamorphic rock: Reactions in a kaolinite-quartz system: …first chemical reaction is a dehydration reaction leading to the formation of a new hydrate. The water released is itself a solvent for silicates and promotes the crystallization of the product phases.

  • dehydrogenation (chemical reaction)

    combustion: Special aspects: …into extremely large groupings, and dehydrogenation, a process that eliminates hydrogen from molecules.

  • dehydrohalogenation (chemical reaction)

    elimination reaction: …for example, is known as dehydrohalogenation; when both leaving atoms are halogens, the reaction is known as dehalogenation. Similarly, the elimination of a water molecule, usually from an alcohol, is known as dehydration; when both leaving atoms are hydrogen atoms, the reaction is known as dehydrogenation. Elimination reactions are also…

  • Dei delitti e delle pene (work by Beccaria)

    penology: …of Cesare Beccaria’s pamphlet on Crimes and Punishments in 1764. This represented a school of doctrine, born of the new humanitarian impulse of the 18th century, with which Jean-Jacques Rousseau, Voltaire, and Montesquieu in France and Jeremy Bentham in England were associated. This, which came afterwards to be known as…

  • Dei Filius (Roman Catholicism)

    First Vatican Council: …dissolved, promulgated two doctrinal constitutions: Dei Filius, a greatly shortened version of the schema on Catholic faith, which deals with faith, reason, and their interrelations; and Pastor Aeternus, which deals with the authority of the pope.

  • Dei sepolcri (work by Foscolo)

    Ugo Foscolo: …his literary reputation with “Dei sepolcri” (Eng. trans., “Of the Sepulchres,” c. 1820), a patriotic poem in blank verse, written as a protest against Napoleon’s decree forbidding tomb inscriptions. In 1808 the poem won for its author the chair of Italian rhetoric at the University of Pavia. When the…

  • Dei Shu (Alaska, United States)

    Haines, city, southeastern Alaska, U.S. Located at the northern end of North America’s longest fjord, it also lies at the northern end of the Alexander Archipelago on a peninsula between the Chilkoot and Chilkat rivers. Situated near the point where the Taiya Inlet meets the Chilkoot Inlet, Haines

  • Dei, Treuga (ecclesiastical decree)

    Truce of God, a measure by the medieval Roman Catholic Church to suspend warfare during certain days of the week and during the period of certain church festivals and Lent. It is traceable to at least the Synod of Elne (1027), which suspended all warfare from Saturday night until prime on Monday.

  • Dei, Treva (ecclesiastical decree)

    Truce of God, a measure by the medieval Roman Catholic Church to suspend warfare during certain days of the week and during the period of certain church festivals and Lent. It is traceable to at least the Synod of Elne (1027), which suspended all warfare from Saturday night until prime on Monday.

  • Deianeira (Greek mythology)

    Heracles: …Achelous for the hand of Deianeira. As he was taking her home, the Centaur Nessus tried to violate her, and Heracles shot him with one of his poisoned arrows. The Centaur, dying, told Deianeira to preserve the blood from his wound, for if Heracles wore a garment rubbed with it…

  • Deianira (Greek mythology)

    Heracles: …Achelous for the hand of Deianeira. As he was taking her home, the Centaur Nessus tried to violate her, and Heracles shot him with one of his poisoned arrows. The Centaur, dying, told Deianeira to preserve the blood from his wound, for if Heracles wore a garment rubbed with it…

  • Deichstrasse (street, Hamburg, Germany)

    Hamburg: Architecture: …to be found in the Deichstrasse, one side of which backs onto the Nikolai canal. Its tall, narrow houses, resembling those of Amsterdam, were originally built from the 17th through the 19th century. It was in one of them, number 42, now a restaurant, that the devastating fire of 1842…

  • deification (religion)

    Eastern Orthodoxy: God and humankind: …rather communion with God and deification (theosis). In the West the church is viewed in terms of mediation (for the bestowing of grace) and authority (for guaranteeing security in doctrine); in the East the church is regarded as a communion in which God and the individual meet once again and…

  • Deighton, Len (English writer)

    Len Deighton, English author, journalist, film producer, and a leading writer of spy stories, his best-known being his first, The Ipcress File (1962), an account of deception and betrayal in an espionage agency. Deighton was educated at the Royal College of Art, London, after service in the Royal

  • Deildartunguhver (hot spring, Iceland)

    Iceland: Relief: The largest, Deildartunguhver, emits nearly 50 gallons (190 litres) of boiling water per second. The total power output of the Torfaj?kull (Torfa Glacier) area, the largest of the 19 high-temperature solfatara regions, is estimated to equal about 1,000 megawatts.

  • Deimos (moon of Mars)

    Deimos, the outer and smaller of Mars’s two moons. It was discovered telescopically with its companion moon, Phobos, by the American astronomer Asaph Hall in 1877 and named for one of the sons of Ares, the Greek counterpart of the Roman god Mars. Deimos is an irregular rocky object having a

  • Deimos (Greek mythology)

    Ares: …sons (by Aphrodite) Phobos and Deimos (Panic and Rout). Also associated with him were two lesser war deities: Enyalius, who is virtually identical with Ares himself, and Enyo, a female counterpart.

  • Deimos Imaging (Spanish company)

    Pedro Duque: …was chief executive officer of Deimos Imaging, a European satellite and geospatial imaging company based in Valladolid, Spain. Duque then rejoined the ESA, serving as head of its flight operations office. In 2015 he resumed his astronaut duties. Three years later he was named Spain’s minister of science, innovation, and…

  • Dein Schweigen, meine Stimme (work by Kaschnitz)

    Marie Luise Kaschnitz: …later collections of poems as Dein Schweigen, meine Stimme (1962; “Your Silence, My Voice”) reflect the sorrow and loneliness Kaschnitz experienced upon the death of her husband, and her subsequent search for meaning and stability in her life.

  • Deinarchus (Greek speech writer)

    Dinarchus, professional speech writer at Athens whose work is generally thought to reflect the incipient decline of Attic oratory. As a metic, or resident alien, he could not participate directly in the political life of Athens. Dinarchus came to prominence in the scandal that followed the flight

  • deindividuation (human behaviour)

    Deindividuation, phenomenon in which people engage in seemingly impulsive, deviant, and sometimes violent acts in situations in which they believe they cannot be personally identified (e.g., in groups and crowds and on the Internet). The term deindividuation was coined by the American social

  • Deinococcus radiodurans (bacteria)

    life: Radiation and nutrient deprivation: …of nuclear physicists, the bacterium Deinococcus radiodurans thrives in the cooling pool of nuclear reactors amid radioactivity levels lethal to mammals. Some life avoids radiation by shielding: algae and some desert plants live under a superficial coating of soil or rock that is more transparent to visible light than to…

  • Deinocrates (Greek architect)

    Dinocrates, Greek architect who prospered under Alexander the Great. He tried to captivate the ambitious fancy of that king with a design for carving Mount Athos into a gigantic seated statue. The plan was not carried out, but Dinocrates designed for Alexander the plan of the new city of

  • Deinonychosauria (dinosaur infraorder)

    dinosaur: Tetanurae: The maniraptorans comprise birds, dromaeosaurs, and troodontids. Dromaeosaurs were medium-size predators with long, grasping arms and hands, moderately long legs, and a specialized stiffened tail that could be used for active balance control. Their feet bore large talons on one toe that were evidently used for…

  • Deinonychus (dinosaur genus)

    Deinonychus, (genus Deinonychus), long-clawed carnivorous dinosaurs that flourished in western North America during the Early Cretaceous Period (145.5 million to 99.6 million years ago). A member of the dromaeosaur group, Deinonychus was bipedal, walking on two legs, as did all theropod dinosaurs.

  • Deinopidae (arachnid)

    Ogre-faced spider, any member of the family Dinopidae (or Deinopidae; order Araneida). One pair of eyes is unusually large, producing an ogrelike appearance. The spiders occur throughout the tropics. One genus, Dinopis, the net-casting spider, carries a web that is thrown over

  • Deinosuchus (fossil reptile genus)

    crocodile: Size range and diversity of structure: Some fossil forms (such as Deinosuchus and Sarcosuchus) may have been between 10 and 12 metres (33 and 40 feet) long. In comparison, the smallest species, the smooth-fronted caiman (Paleosuchus) and the dwarf crocodile (Osteolaemus tetraspis), reach about 1.7 metres (about 6 feet) in length as adults.

  • deinstitutionalization (sociology)

    Deinstitutionalization, in sociology, movement that advocates the transfer of mentally disabled people from public or private institutions, such as psychiatric hospitals, back to their families or into community-based homes. While concentrated primarily on the mentally ill, deinstitutionalization

  • Deioces (king of Media)

    Deioces, petty Median chieftain subject to the kingdom of Mannai in modern Iranian Azerbaijan; later tradition made him the founder of the Median empire. According to the 5th-century-bc Greek historian Herodotus, Deioces was the first king of the Medes. Herodotus claimed that the Median tribes at

  • Deiotarus (king of Galatia)

    Deiotarus, tetrarch of the Tolistobogii (of western Galatia, now in western Turkey), later king of all Galatia, who, as a faithful ally of the Romans, became involved in the struggles between the Roman generals that led to the fall of the republic. At the beginning of the Third Mithradatic War

  • Deiphobus (Greek mythology)

    Helen of Troy: …slain, Helen married his brother Deiphobus, whom she betrayed to Menelaus once Troy was captured. Menelaus and Helen then returned to Sparta, where they lived happily until their deaths.

  • Deiphon (trilobite genus)

    Deiphon, genus of trilobites (extinct arthropods) easily recognized in fossil form in Silurian rocks in North America because of its highly unusual shape (the Silurian Period began 438 million years ago and ended 408 million years ago). The pleural lobes (at the sides of the body axis) are reduced

  • Deipnosophistai (work by Athenaeus)

    Athenaeus: …Greek grammarian and author of Deipnosophistai (“The Gastronomers”), a work in the form of an aristocratic symposium, in which a number of learned men, some bearing the names of real persons, such as Galen, meet at a banquet and discuss food and other subjects. In its extant form the work…

  • Deir el-Bahri (archaeological site, Egypt)

    Dayr al-Ba?rī, Egyptian archaeological site in the necropolis of Thebes. It is made up of a bay in the cliffs on the west bank of the Nile River east of the Valley of the Kings. Its name (Arabic for “northern monastery”) refers to a monastery built there in the 7th century ce. Of the three ancient

  • Deir el-Medina (ancient settlement, Egypt)

    Dayr al-Madīnah, ancient site on the west bank of the Nile River at Thebes in Upper Egypt. It is known primarily as the location of a settlement for craftsmen who laboured on the royal tombs, especially those in the nearby Valley of the Kings. The village, the best-preserved of its type, has

  • Deir ez-Zor (Syria)

    Dayr al-Zawr, town, eastern Syria. The town is situated on the right bank of the Euphrates River; its name, meaning “monastery of the grove” (zawr, “tamarisk”), is probably derived from the ancient city of Auzara, or Azuara, situated nearby. The Ottomans built the present town in 1867 to curb the

  • Deir Tasa (archaeological site, Egypt)

    Tasian culture: …River at al-Badārī and at Deir Tasa. Tasian remains are somewhat intermingled with the materials of the subsequent Badarian stage, and, although the total absence of metal and the more primitive appearance of its pottery would seem to argue for an earlier date, it is also possible that the Tasian…

  • Deira (historical kingdom, England)

    Deira, a northern Anglo-Saxon kingdom in Britain which, by the last quarter of the 7th century ad, had been united with its neighbour Bernicia (q.v.) to form the kingdom of Northumbria. Deira stretched from the Humber to the Tees River. There is a tradition that its first recorded king, Aelle,

  • Deirdre (Irish literature)

    Deirdre, in early Irish literature, the gentle and fair heroine of The Fate of the Sons of Usnech (Oidheadh Chloinne Uisneach), the great love story of the Ulster cycle. First composed in the 8th or 9th century, the story was revised and combined in the 15th century with The Fate of the Children of

  • Deirdriu (Irish literature)

    Deirdre, in early Irish literature, the gentle and fair heroine of The Fate of the Sons of Usnech (Oidheadh Chloinne Uisneach), the great love story of the Ulster cycle. First composed in the 8th or 9th century, the story was revised and combined in the 15th century with The Fate of the Children of

  • Deirgeirt, Loch (lake, Ireland)

    Lough Derg, lake on the River Shannon, situated at the boundary of Counties Tipperary, Galway, and Clare, in Ireland. Lough Derg is 24 miles (39 km) long and 0.5 to 8 miles (1 to 13 km) wide. It is 37 square miles (96 square km) in area, with a maximum depth of 119 feet (36 m). The lake has many

  • Deirochelys reticularia (reptile)

    Chicken turtle, (Deirochelys reticularia), edible freshwater turtle (family Emydidae) found in the southeastern United States. The chicken turtle has an exceptionally long neck and a finely grooved upper shell covered with an open network of yellowish lines on a brownish background. Shell length is

  • DEISA (supercomputing network)

    DEISA, former European consortium (2002–11) of national supercomputer centres—partially funded by the European Union (EU)—that were networked for high-performance computing, especially to facilitate distributed computing for scientific research. DEISA also maintained a network link with TeraGrid, a

  • Deisenhofer, Johann (German American biochemist)

    Johann Deisenhofer, German American biochemist who, along with Hartmut Michel and Robert Huber, received the Nobel Prize for Chemistry in 1988 for their determination of the structure of certain proteins that are essential to photosynthesis. Deisenhofer earned a doctorate from the Max Planck

  • Deism (religious philosophy)

    Deism, an unorthodox religious attitude that found expression among a group of English writers beginning with Edward Herbert (later 1st Baron Herbert of Cherbury) in the first half of the 17th century and ending with Henry St. John, 1st Viscount Bolingbroke, in the middle of the 18th century. These

  • Deisseroth, Karl (American psychiatrist and bioengineer)

    Karl Deisseroth, American psychiatrist and bioengineer best known for his development of methods that revolutionized the study of the brain and led to major advances in neuroscience and biomedical engineering. Deisseroth earned a bachelor’s degree in biochemical sciences from Harvard University in

  • Deiters cell (anatomy)

    human ear: Organ of Corti: …by a phalangeal cell of Deiters, or supporting cell, which holds the base of the hair cell in a cup-shaped depression. From each Deiters’ cell a projection extends upward to the stiff membrane, the reticular lamina, that covers the organ of Corti. The top of the hair cell is firmly…

  • deity (deity)

    god and goddess: …generic terms for the many deities of ancient and modern polytheistic religions. Such deities may correspond to earthly and celestial phenomena or to human values, pastimes, and institutions, including love, marriage, hunting, war, and the arts. While some are capable of being killed, many are immortal. Although they are always…

  • Deivas (Baltic god)

    Dievs, in Baltic religion, the sky god. Dievs and Laima, the goddess of human fate, determine human destiny and world order. Dievs is a wooer of Saule, the sun. As pictured by the pre-Christian Balts, he is an Iron Age Baltic king who lives on a farmstead in the sky. Wearing a silver gown,

  • deive (Baltic folklore)

    Lauma, in Baltic folklore, a fairy who appears as a beautiful naked maiden with long fair hair. Laumas dwell in the forest near water or stones. Yearning for children but being unable to give birth, they often kidnap babies to raise as their own. Sometimes they marry young men and become excellent

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