circulatory system: Chordata: A large sac, the sinus venosus, is situated below the posterior of the pharynx and collects blood from all parts of the body. The blood passes forward through the subpharyngeal ventral aorta, from which branches carry it to small, accessory, branchial hearts that pump it upward through the gill…

venous sinus, in human anatomy, any of the channels of a branching complex sinus network that lies between layers of the dura mater, the outermost covering of the brain, and functions to collect oxygen-depleted blood. Unlike veins, these sinuses possess no muscular coat. Their lining is

sinusitis, acute or chronic inflammation of the mucosal lining of one or more paranasal sinuses (the cavities in the bones that adjoin the nose). Sinusitis commonly accompanies upper respiratory viral infections and in most cases requires no treatment. Purulent (pus-producing) sinusitis can occur,

sinusoid, irregular tubular space for the passage of blood, taking the place of capillaries and venules in the liver, spleen, and bone marrow. The sinusoids form from branches of the portal vein in the liver and from arterioles (minute arteries) in other organs. The walls of the sinusoids are lined

mathematics: Mathematical astronomy: …to what is actually a sinusoidal variation.) While observations extending over centuries are required for finding the necessary parameters (e.g., periods, angular range between maximum and minimum values, and the like), only the computational apparatus at their disposal made the astronomers’ forecasting effort possible.

Yahya Sinwar is the leader (2017– ) of Hamas in the Gaza Strip and an early architect of Hamas’s armed wing. Sinwar is considered one of the masterminds behind the October 7, 2023, attacks on Israel, the deadliest day for Israel since its independence (see Israel-Hamas War). Sinwar was born in the

Yahya Sinwar is the leader (2017– ) of Hamas in the Gaza Strip and an early architect of Hamas’s armed wing. Sinwar is considered one of the masterminds behind the October 7, 2023, attacks on Israel, the deadliest day for Israel since its independence (see Israel-Hamas War). Sinwar was born in the

South Africa: Black literature: Sotho), Thomas Mofolo (South Sotho), Guybon Sinxo (Xhosa), and B.W. Vilakazi (Zulu) have been more deeply influenced in their written work by the oral traditions of their cultures than by European forms. Other Black writers, beginning in the 1930s with Solomon Plaatje and his historical novel Mhudi (1930), have explicitly…

Viktor Pelevin: …awards, including Siny fonar (1991; The Blue Lantern and Other Stories) and Problema vervolka v sredney polose (1994; A Werewolf Problem in Central Russia and Other Stories, also published as The Sacred Book of the Werewolf), both of which won a Russian Booker Prize. Not only were his works wildly…

Andrey Donatovich Sinyavsky was a Russian critic and author of novels and short stories who was convicted of subversion by the Soviet government in 1966. Sinyavsky graduated from Moscow University in 1952 and later joined the faculty of the Gorky Institute of World Literature. He contributed to the

Robert Siodmak was a German director who was known for his bleak film noirs, notably Phantom Lady (1944), The Killers (1946), and Criss Cross (1949). Siodmak worked as a film editor before codirecting his first feature, a pseudodocumentary entitled Menschen am Sonntag (People on Sunday), in 1930;

Zambezi River: Physiography: …of rapids that extends from Ngonye (Sioma) Falls south to the Katima Mulilo Rapids, after which for about 80 miles it forms the border between Zambia to the north and the eastern Caprivi Strip—an extension of Namibia—to the south. In this stretch the river meanders through the broad grasslands of…

Sion, capital of Valais canton, southwestern Switzerland. It lies along the Rhône River, at the mouth of La Sionne River, southeast of Lake Geneva (Lac Léman). It originated as a Celtic and Roman settlement called Sedunum. Sion became the seat of a bishop in the late 6th century, and from 999 the

Siôn Cent was a Welsh religious poet who challenged the values of the bardic tradition. According to Siôn Cent, the traditional praise of the nobles was hollow flattery and lies. His writings (poems in cywydd metre) reflect the influence of the moralists of the European Middle Ages, treating of

Siôn Cent was a Welsh religious poet who challenged the values of the bardic tradition. According to Siôn Cent, the traditional praise of the nobles was hollow flattery and lies. His writings (poems in cywydd metre) reflect the influence of the moralists of the European Middle Ages, treating of

Siôn Cent was a Welsh religious poet who challenged the values of the bardic tradition. According to Siôn Cent, the traditional praise of the nobles was hollow flattery and lies. His writings (poems in cywydd metre) reflect the influence of the moralists of the European Middle Ages, treating of

Siôn Cent was a Welsh religious poet who challenged the values of the bardic tradition. According to Siôn Cent, the traditional praise of the nobles was hollow flattery and lies. His writings (poems in cywydd metre) reflect the influence of the moralists of the European Middle Ages, treating of

Siôn Cent was a Welsh religious poet who challenged the values of the bardic tradition. According to Siôn Cent, the traditional praise of the nobles was hollow flattery and lies. His writings (poems in cywydd metre) reflect the influence of the moralists of the European Middle Ages, treating of

Single Integrated Operational Plan (SIOP), U.S. strategic war-fighting plan for the use of nuclear weapons that contains the specifics of targeting orders, scheduling, and needed weapons. The first SIOP was approved in late 1960 as an attempt to develop a more systematic approach to the various

Eugenio Monti: …Austria, Monti and his partner Sergio Siorpaes were the defending world champions and found themselves in heated competition with the British team of Anthony Nash and Robin Dixon. When a faulty axle on the British sled was sure to lead to their withdrawal, Monti took a part from his own…

Siouan languages, family of languages in North America spread primarily across the Great Plains, extending from Canada to Mississippi to North Carolina. The languages belonging to this family are classified as follows. The Catawban branch (formerly spoken in North and South Carolina) is the most

Macro-Siouan hypothesis, a proposal, now mostly abandoned, of a distant family relationship (phylum, macro-family, or superstock) that would group together languages in North America of the Siouan, Iroquoian, and Caddoan language families and the language isolate Yuchi. Earlier versions of the

Siouan languages, family of languages in North America spread primarily across the Great Plains, extending from Canada to Mississippi to North Carolina. The languages belonging to this family are classified as follows. The Catawban branch (formerly spoken in North and South Carolina) is the most

Sioux, broad alliance of North American Indian peoples who spoke three related languages within the Siouan language family. The name Sioux is an abbreviation of Nadouessioux (“Adders”; i.e., enemies), a name originally applied to them by the Ojibwa. The Santee, also known as the Eastern Sioux, were

Sioux City, city, seat (1856) of Woodbury county, northwestern Iowa, U.S. It lies on the Missouri River (bridged to South Sioux City, Nebraska) at the influx of the Big Sioux and Floyd rivers, where Iowa, South Dakota, and Nebraska meet. The former territory of Omaha, Sioux, and Oto peoples, the

Chicago White Sox, American professional baseball team based in Chicago that plays in the American League (AL). The White Sox have won three World Series titles, two in the early 1900s (1906, 1917) and the third 88 years later, in 2005. They are often referred to as the “South Siders,” a reference

Sioux Falls, city, seat (1868) of Minnehaha county, southeastern South Dakota, U.S. It lies on the Big Sioux River, near the Iowa and Minnesota state lines. Sioux Indians occupied the area when the town site, which was named for the falls of the river, was founded in 1857 by land speculators. In

Sioux Falls: …include Augustana College (1860), the University of Sioux Falls (1883), North American Baptist Seminary, Kilian Community College (1977), Southeast Technical Institute (1968), and a centre (1992) combining educational programs from Dakota State University, South Dakota State University, and the University of South Dakota. The state penitentiary and a school for…

American frontier: How the West was won: history) during the Sioux Uprising (Dakota War) in southern Minnesota. Two years later, U.S. troops carried out the massacre of hundreds of surrendered and partially disarmed Cheyenne at the Sand Creek Massacre.

Crazy Horse: …Sioux resistance to European Americans’ invasion of the northern Great Plains.

The Oceti Sakowin, or Sioux, are an alliance of Native American peoples who speak three related Siouan languages: the Dakota-speaking Santee, the Nakota-speaking Yankton, and the Lakota-speaking Teton, each having lesser divisions. These peoples call themselves the Oceti Sakowin (“Seven Council

punk: the Clash (“Complete Control”), and Siouxsie and the Banshees (“Hong Kong Garden”) scored hits in 1977–78. Anarchist, decentralizing, and libertarian, U.K. punk was drawn into the polarized politics of British society and by 1979 had self-destructed as a pop style. Postpunk groups such as Public Image Ltd and Joy Division…

Iron Gate: …until the construction of the Sip Canal in 1896. A joint development project of Romania and Yugoslavia on the Danube River (including a dam and hydroelectric power plant) was completed in 1972, providing equal amounts of energy to each country and quadrupling the annual tonnage of shipping. The name Iron…

sipahi, feudal cavalryman of the Ottoman Empire whose status resembled that of the medieval European knight. The sipahi (from Persian for “cavalryman”) was holder of a fief (timar; Turkish: tımar) granted directly by the Ottoman sultan and was entitled to all of the income from it in return for

sipahi, feudal cavalryman of the Ottoman Empire whose status resembled that of the medieval European knight. The sipahi (from Persian for “cavalryman”) was holder of a fief (timar; Turkish: tımar) granted directly by the Ottoman sultan and was entitled to all of the income from it in return for

Orinoco River: Physiography of the Orinoco: …Colombian Llanos, and the Guayapo, Sipapo, Autana, and Cuao rivers from the Guiana Highlands.

kiva: …word for this element is sípapu. Although a kiva’s most important purpose is as a venue for rituals, kivas can also be used for political meetings and casual gatherings of the men of the village. Women perform their rituals in other venues and rarely enter kivas.

Natural Bridges National Monument: The largest bridge, Sipapu, rises 220 feet (67 metres) above the streambed and has a span of 268 feet (82 metres). The Kachina and Owachomo bridges are, respectively, 210 and 106 feet (64 and 32 metres) high with spans of 204 and 180 feet (62 and 55 metres).…

surah: …30 equal sections known as ajzāʾ (singular juzʾ; Persian and Urdu sipāra, or pāra). These break up the surahs arbitrarily, without regard to content, into 30 parts in order to facilitate the systematic reading of the entire Qurʾān in 30 days, or one lunar month.

Siparia, village, southwestern Trinidad, Trinidad and Tobago, southeastern West Indies. Located 10 miles (16 km) south of the port of San Fernando, it lies in a cacao-growing region near large oil fields. Siparia originated as the site of a Spanish mission, and the village has a Capuchin pilgrimage

Laurales: Other families: …decoction of the bark of Siparuna cujabana (family Siparunaceae) from Brazil is used by local residents to induce sweating and as an abortifacient.

Laurales: Distribution and abundance: The family Siparunaceae includes 75 species in two genera. Glossocalyx, from tropical West Africa, has four species. The remainder of the species in the family are in the genus Siparuna, found in Mexico, Central America, and tropical South America.

Siphnus, Greek island of the Cyclades (Modern Greek: Kykládes) group, consisting of a limestone ridge whose principal peaks, Profíts Ilías (2,277 feet [694 metres]) and Áyios Simeón (1,624 feet [495 metres]), are crowned by Byzantine churches. It constitutes a dímos (municipality) in the South

Siphnus, Greek island of the Cyclades (Modern Greek: Kykládes) group, consisting of a limestone ridge whose principal peaks, Profíts Ilías (2,277 feet [694 metres]) and Áyios Simeón (1,624 feet [495 metres]), are crowned by Byzantine churches. It constitutes a dímos (municipality) in the South

bivalve: Food and feeding: …prey into a funnellike inhalant siphon (Cuspidaria). Food is then pushed into the mouth by the palps and foot. Others evert the inhalant siphon, like a hood, over the prey (Poromya and Lyonsiella). Prey items include small bottom-dwelling crustaceans, polychaete worms, and larvae of other benthic animals.

siphon, instrument, usually in the form of a tube bent to form two legs of unequal length, for conveying liquid over the edge of a vessel and delivering it at a lower level. Siphons may be of any size. The action depends upon the influence of gravity (not, as sometimes thought, on the difference in

flea, (order Siphonaptera), any of a group of bloodsucking insects that are important carriers of disease and can be serious pests. Fleas are parasites that live on the exterior of the host (i.e., are ectoparasitic). As the chief agent transmitting the Black Death (bubonic plague) in the Middle

gastropod: Classification: …or marine limpets with (Siphonariidae) gill-like structures or with a lung (Gadinidae). Superfamily Amphibolacea Operculum present; shell conical; with pulmonary cavity; brackish water; burrow in sand; 1 family. Superfamily Ellobiacea Conical shells; pulmonary chamber; in tidal

cnidarian: Annotated classification: Order Siphonophora Pelagic polypoid colonies with greatest degree of polymorphism in phylum; lack medusae. Oceanic; worldwide. Includes Portuguese man-of-war, Physalia. Order Stylasterina Hydrocorals. Resembling millepores; colonies erect and branching or prostrate. Commonly yellow, red, or purple. Reduced medusae not

Gymnophiona: Annotated classification: Family Siphonopidae Cretaceous (145.5–65.5 million years ago) to present; imperforate stapes and no inner mandibular teeth; oviparous; 7 genera, 19 species; South America. Family Typhlonectidae Cretaceous (145.5–65.5 million years ago) to present; tail absent; mouth recessed; premaxillae fused with nasals; prefrontals absent; squamosal articulating with

cephalopod, any member of the class Cephalopoda of the phylum Mollusca, a small group of highly advanced and organized, exclusively marine animals. The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives. The extinct forms outnumber the living, the class having attained

lower vascular plant: Vascular system: …common in fern stems are siphonosteles, having a pith in the centre with the vascular tissue forming a cylinder around it. Where a fern leaf is attached to a stem, a part of the vascular tissue of the stem goes into it (a leaf trace), making a slight gap, filled…

crustacean: Annotated classification: Order Siphonostomatoida Mouth tubelike or forms a sucker with styletlike mandibles; adult segmentation reduced or lost; parasites and commensals on fish and invertebrates; mostly marine, some freshwater. Order Monstrilloida Parasites on marine worms and mollusks; adults free-swimming; lack mouthparts and gut; biramous swimming legs; about 80…

seashell: …a porous tube called the siphuncle. The chambers contain quantities of water and gas that are adjusted by the siphuncle to achieve neutral buoyancy. Many seashells are brightly coloured in complicated designs by a variety of pigments secreted by special cells in the edge of the mantle. In some cases…

sucking louse, (suborder Anoplura), any of some 500 species of small, wingless, flat lice (order Phthiraptera) that have piercing and sucking mouthparts and live on blood and tissue fluids of mammals as an ectoparasite (external parasite). The adult sucking louse, or true louse, glues her eggs, or

Dmitry Sergeyevich Sipyagin was a conservative Russian minister of the interior (1900–02), known for his absolute allegiance to autocracy. Sipyagin was born into a family of the old nobility and graduated from the University of St. Petersburg in 1876, after which he entered government service in

Finland: Domestic affairs: The Centre Party, led by Juha Sipilä, fared best, capturing 49 seats, followed by the Finns (the renamed True Finns), who secured 38 seats, the NCP with 37 seats, and the Social Democrats with 34. When negotiations ended in May, Sipilä assumed the post of prime minister, having formed a…

Siping, city, southwestern Jilin sheng (province), northeastern China. It is located near the border with neighbouring Liaoning province. Siping is centrally situated in the northern Liao River portion of the Northeast (Manchurian) Plain. It was a place of little importance until the completion in

Siping, city, southwestern Jilin sheng (province), northeastern China. It is located near the border with neighbouring Liaoning province. Siping is centrally situated in the northern Liao River portion of the Northeast (Manchurian) Plain. It was a place of little importance until the completion in

Marie Byrd Land: …and surveyed by a coworker, Paul A. Siple, in 1935. The U.S. research base, Byrd Station, was opened in 1959 and has 20 to 30 people working there in the warmer months.

Gestapo: …of a new organization, the Sicherheitspolizei (Sipo; “Security Police”). Under a 1939 SS reorganization, the Sipo was joined with the Sicherheitsdienst, an SS intelligence department, to form the Reichssicherheitshauptamt (“Reich Security Central Office”) under Heydrich. In that bureaucratic maze, the functions of the Gestapo often overlapped with those of other…

Manfredonia: …the site of the ancient Sipontum, conquered by the Romans in 217 bc and the see of a bishop from the 1st century ad. Abandoned in the 13th century because nearby stagnant lagoons had made the site unhealthy, Sipontum’s inhabitants settled in Manfredonia, founded about 1260 by Manfred, king of…

Sippar, ancient city of Babylonia, located southwest of present Baghdad, central Iraq. Sippar was subject to the 1st dynasty of Babylon, but little is known about the city before 1174 bc, when it was sacked by the Elamite king Kutir-Nahhunte. It recovered and was later captured by the Assyrian king

Germanic law: Tribal Germanic institutions: …institution was the “sib” (sippe), a term that meant both a clan—the extended family composed of all those related by blood, however remotely, and subject to a clan chief—and also a household or narrow family, whose members were under the mund (guardianship) of the family head. A boy remained…

John Oliver Killens: …at Fisk he also wrote ’Sippi (1967), which tells the story of a college student embroiled in the struggle to achieve the right to vote. Though its characters are from the South, the story takes place in New York City, Killens’s first novel to be set in the North. From…

Shivpuri, city, northern Madhya Pradesh state, central India. It is situated on an elevated watershed from which streams radiate in all directions, about 55 miles (90 km) southwest of Gwalior. Shivpuri formerly served as a summer capital of Gwalior princely state. In 1804 it was captured from the

ancient Egypt: Last years of the 19th dynasty: His successor, Siptah, was installed on the throne by a Syrian royal butler, Bay, who had become chancellor of Egypt. Siptah was succeeded by Seti II’s widow Tausert, who ruled as king from c. 1192 to c. 1191 bce and counted her regnal years from the death…

Sipuel v. Board of Regents, case in which the U.S. Supreme Court on January 12, 1948, ruled unanimously (9–0) to force the University of Oklahoma law school to admit Ada Lois Sipuel, the school’s first African American student. Sipuel became the first African American woman to attend an all-white

Sipuel v. Board of Regents: …Oklahoma law school to admit Ada Lois Sipuel, the school’s first African American student. Sipuel became the first African American woman to attend an all-white law school in the South, earning a master’s degree from the University of Oklahoma in 1951.

prostate cancer: Treatment: …with an agent known as sipuleucel-T (Provenge), which is designed to activate the immune system to attack cancer cells. Sipuleucel-T was approved by the U.S. Food and Drug Administration in 2010, becoming the first immunotherapeutic agent available for the treatment of prostate cancer. Sipuleucel-T is tailored specifically for each patient.…

peanut worm, any member of the invertebrate phylum Sipuncula, a group of unsegmented marine worms. The head bears a retractable “introvert” with the mouth at its end. The mouth is usually surrounded by one or more rings of tentacles. Peanut worms vary in length from a few to 500 millimetres (1.6

peanut worm, any member of the invertebrate phylum Sipuncula, a group of unsegmented marine worms. The head bears a retractable “introvert” with the mouth at its end. The mouth is usually surrounded by one or more rings of tentacles. Peanut worms vary in length from a few to 500 millimetres (1.6

Amos Oz: …Sipur ʿal ahavah ve-ḥoshekh (2002; A Tale of Love and Darkness) drew wide critical acclaim. Temunot me-hạye ha-kefar (2009; Scenes from Village Life) and Ben hạverim (2012; Between Friends) are, respectively, a novel set in an Israeli village and a collection of short stories set on a kibbutz. Ha-Beśorah ʿal-pi…

Dmitry Sergeyevich Sipyagin was a conservative Russian minister of the interior (1900–02), known for his absolute allegiance to autocracy. Sipyagin was born into a family of the old nobility and graduated from the University of St. Petersburg in 1876, after which he entered government service in

Petra: …narrow gorge known as the Siq (Wadi Al-Sīq). Among the first sites viewed from the Siq is the Khaznah (“Treasury”), which is actually a large tomb. Al-Dayr (“the Monastery”) is one of Petra’s best-known rock-cut monuments; it is an unfinished tomb facade that during Byzantine times was used as a…

David Alfaro Siqueiros was a Mexican painter and muralist whose art reflected his Marxist political ideology. He was one of the three founders of the modern school of Mexican mural painting (along with Diego Rivera and José Clemente Orozco). A political activist since his youth, Siqueiros studied

Siquijor, island, south-central Philippines. Part of the central Visayan Islands archipelago, it is located in the Bohol (Mindanao) Sea, 19 miles (30 km) southeast of Negros island. Siquijor town on the north coast is the largest settlement. It was called Isla de Fuegos (“Island of Fires”) by the

Sir Almroth Edward Wright was a British bacteriologist and immunologist best known for advancing vaccination through the use of autogenous vaccines (prepared from the bacteria harboured by the patient) and through antityphoid immunization with typhoid bacilli killed by heat. Wright received his

Sir Barton, (foaled 1916), American racehorse (Thoroughbred) who in 1919 became the first horse to win the Kentucky Derby, the Preakness Stakes, and the Belmont Stakes. For that accomplishment he was retroactively named the first winner of the Triple Crown of American horse racing when that title

Pembrokeshire, county of southwestern Wales, bounded on the northeast by Ceredigion, on the east by Carmarthenshire, on the south by the Bristol Channel, and on the west and northwest by St. Bride’s Bay and Cardigan Bay of St. George’s Channel. The county’s rugged and convoluted coastline forms a

Charles Barkley is a former professional basketball player whose larger-than-life character made him one of the most popular figures in National Basketball Association (NBA) history. Over the course of his 16-year NBA career, Barkley became the fourth player to amass 20,000 points, 10,000 rebounds,

echidna: Long-beaked echidnas: Sir David’s long-beaked echidna, which was first discovered in 1961 (but was not described scientifically until 1999), is about the size of a short-beaked echidna. It is distinguished from other long-beaked echidnas by its smaller size and by a shorter, straighter beak, although in other…

Denbighshire, county of northern Wales extending inland from the Irish Sea coast. The present county of Denbighshire includes the Vale of Clwyd along the River Clwyd and an inland area between the Clwydian Range in the east and the Clocaenog Forest in the west that ascends to the Berwyn mountains

Banff National Park: Natural history: …11,365 feet (3,464 metres), and Mount Sir Douglas in the far southeast, with an elevation of 11,175 feet (3,406 metres). Banff contains active glaciers, including a portion of the extensive Columbia Icefield to the north, and montane wetlands and meadows, such as the valleys of the Bow and Red Deer…

Montgomeryshire, historic county of north-central Wales, along the English border. Montgomeryshire is an area of wooded hills and valleys encircled by higher mountains, including Long Mountain in the east, Clifaesty Hill in the south, Plynlimon in the west, and the Berwyn mountains in the north. It

Stevie Wonder: …Woman,” “I Wish,” and “Sir Duke.”

Sir Edward Pellew Group, cluster of barren sandstone islands in the Gulf of Carpentaria, near the mouth of the McArthur River, in northeastern Northern Territory, Australia. The islands have a total area of 800 square miles (2,100 square km). Vanderlin, the largest, is 20 miles (32 km) long by 8

Radnorshire, historic county, east-central Wales, on the English border. It covers an area of mountainous terrain and highlands, including Radnor Forest, with a central valley formed by the River Wye. Radnorshire lies completely within the present county of Powys. Burial mounds and Iron Age hill

Brecknockshire, historic county, south-central Wales, named for Brychan, a 5th-century prince later known as Brycheiniog. Brecknockshire is mostly part of the present Powys county, although small areas in the south lie within the present Monmouthshire county and the county boroughs of Blaenau

Monmouthshire, county of southeastern Wales. The present county of Monmouthshire borders England to the east, the River Severn estuary to the south, the county boroughs of Newport, Torfaen, and Blaenau Gwent to the west, and the county of Powys to the north. The heart of the county is the plain of

Gallant Fox: Breeding and early years: His sire was Sir Gallahad III and his dam was Marguerite. It was largely because of Gallant Fox’s illustrious accomplishments in horse racing three years later that Sir Gallahad III became one of the world’s leading stallions through the 1930s and ’40s. Gallant Fox’s owner, William Woodward, was…

Sir Gawayne and the Grene Knight, Middle English alliterative poem of unknown authorship, dating from the second half of the 14th century (perhaps 1375). It is a chivalric romance that tells a tale of enchantment in an Arthurian setting. Its hero, Sir Gawayne (Gawain), is presented as a devout but

Sir Gawayne and the Grene Knight, Middle English alliterative poem of unknown authorship, dating from the second half of the 14th century (perhaps 1375). It is a chivalric romance that tells a tale of enchantment in an Arthurian setting. Its hero, Sir Gawayne (Gawain), is presented as a devout but

When British exploration of the Arctic was at its peak during the first half of the 19th century, disasters were not uncommon. Many lives were lost in search of the Northwest Passage, a sea route through the North American Arctic. However, few doomed missions captured the popular imagination as

John Dryden: Writing for the stage: …of Newcastle) under the title Sir Martin Mar-all.

ballad: Disaster: …poetic of all ballads “Sir Patrick Spens” cannot be fixed, but “The Titanic,” “Casey Jones,” “The Wreck on the C & O,” and “The Johnstown Flood” are all circumstantially based on actual events.

Virginia reel: …the English dance called the Sir Roger de Coverley. Brought to Virginia by English colonists, the Sir Roger de Coverley in time became the Virginia reel, the several versions of which range from the polished form danced in the ballrooms of 18th-century Virginia to the livelier present-day version.

Roger John Brownlow Keyes, 1st Baron Keyes was a British admiral who planned and directed the World War I raid on the German base at Zeebrugge, Belg., April 22–23, 1918, and thus helped to close the Strait of Dover to German submarines. Keyes entered the Royal Navy in 1885. For bold action during

Selkirk Mountains: …10,000 feet (3,000 metres), with Mount Sir Sanford (11,555 feet [3,522 metres]) being the highest. In many places the Selkirks rise abruptly more than 8,000 feet (2,400 metres) above adjacent valley floors, affording wild and magnificent scenery. Glacier and Mount Revelstoke national parks, in the northern part of the range,…

Britannica’s online article on chivalry is today dwarfed by that in the supplement to the fourth, fifth, and sixth editions (1815–24), which ran to 30 double-column pages—a simple but dramatic lesson in the mutability of ideas and institutions. However, that 30-page article—which is reproduced in