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  • Circaeum Promontorium (promontory, Italy)

    Mount Circeo, isolated promontory, Latina provincia, Lazio (Latium) regione, on the southwestern coast of Italy on the Tyrrhenian Sea, just northwest of the Gulf of Gaeta. It consists of a conspicuous ridge of limestone, 3.5 miles (6 km) long by 1 mile (1.6 km) wide, rising to a height of 1,775

  • Circassia (historic region, Russia)

    Cherkessia, historic region of Russia at the western end of the Greater Caucasus Range on the Black Sea. It derives its name from the Circassian (Russian: Cherkess) people. From ancient times Cherkessia acquired the exotic reputation common to lands occupying a crucial area between rival empires.

  • Circassian (people)

    Circassian, member of a Caucasian people speaking a northwest Caucasian language (see Kabardian language). From ancient times Circassia, comprising roughly the northwestern region of the Caucasus, acquired the exotic reputation common to lands occupying a crucial area between rival empires. The

  • Circassian period (Mamlūk history)

    Mamluk: The Mamluk dynasty: …and the latter the “Burjī,” because of the political dominance of the regiments known by these names during the respective times. The contemporary Muslim historians referred to the same divisions as the “Turkish” and “Circassian” periods, in order to call attention to the change in ethnic origin of the…

  • Circassian walnut (tree)

    walnut: …North America and English, or Persian, walnut (J. regia), native to Iran, are valuable timber trees that produce edible nuts. The butternut (J. cinerea) of eastern North America also produces an edible nut. See also butternut.

  • Circe (opera by Keiser)

    Reinhard Keiser: In his last, Circe (1734), there were 21 German arias and 23 Italian arias, some written by Leonardo Leo, Johann Adolf Hasse, and George Frideric Handel. Keiser’s works show French influence in their ballet scenes. Unlike the Neapolitan operas, but like those of the earlier Venetian style, they…

  • Circe (Greek mythology)

    Circe, in Greek legend, a sorceress, the daughter of Helios, the sun god, and of the ocean nymph Perse. She was able by means of drugs and incantations to change humans into wolves, lions, and swine. The Greek hero Odysseus visited her island, Aeaea, with his companions, whom she changed into

  • Circeii (Italy)

    Mount Circeo: The modern village of San Felice Circeo, toward the eastern end of the promontory, occupies the site of the ancient Circeii, a fortress of the ancient Volsci people that became a Roman colony in 393 bc and a popular summer residence in the Roman imperial period. During the Middle…

  • Circeo, Mount (promontory, Italy)

    Mount Circeo, isolated promontory, Latina provincia, Lazio (Latium) regione, on the southwestern coast of Italy on the Tyrrhenian Sea, just northwest of the Gulf of Gaeta. It consists of a conspicuous ridge of limestone, 3.5 miles (6 km) long by 1 mile (1.6 km) wide, rising to a height of 1,775

  • Čirčik (Uzbekistan)

    Chirchiq, industrial city, eastern Uzbekistan. It lies along the Chirchiq River, 20 miles (30 km) northeast of Tashkent. Chirchiq was created in 1935 from several villages that developed with the construction of the Chirchiq hydroelectric power station and a large electrochemical works producing

  • Circinae (bird)

    Harrier, any of about 11 species of hawks of the subfamily Circinae (family Accipitridae). They are plain-looking, long-legged, and long-tailed birds of slender build that cruise low over meadows and marshes looking for mice, snakes, frogs, small birds, and insects. Harriers are about 50 cm (20

  • Circinus (constellation)

    Circinus, (Latin: “Compass”) constellation in the southern sky at about 15 hours right ascension and 60° south in declination. Its brightest star is Alpha Circini, with a magnitude of 3.2. The Circinus Galaxy is one of the nearest Seyfert galaxies at a distance of about 13 million light-years. The

  • circle (mathematics)

    Circle, geometrical curve, one of the conic sections, consisting of the set of all points the same distance (the radius) from a given point (the centre). A line connecting any two points on a circle is called a chord, and a chord passing through the centre is called a diameter. The distance around

  • Circle (manifesto by Gabo, Martin and Nicholson)

    Naum Gabo: …by editing the collective manifesto Circle in 1937 with the abstract painter Ben Nicholson. Curves replaced angles in Gabo’s new spatial constructions made of taut wire and plastic thread. He moved to the United States in 1946, and in 1953–54 he taught at the Harvard Graduate School of Architecture. During…

  • circle (jewelry)

    ring: …consists of three parts: the circle, or hoop; the shoulders; and the bezel. The circle can have a circular, semicircular, or square cross-section, or it can be shaped as a flat band. The shoulders consist of a thickening or enlargement of the circle wide enough to support the bezel. The…

  • circle dance (dance)

    country dance: …in three characteristic formations: (1) circular, for an indefinite number of couples (“round” dances), (2) “longways” set, double-file line for an indefinite number of couples, men on one side, women on the other, and (3) geometric formations (e.g., squares, triangles) or sets, usually for two, three, or four couples. The…

  • Circle Dances (international organization)

    folk dance: Dancing for enlightenment: The Circle Dance phenomenon was developed by the German dancer Bernard Wosien, who encountered circle-type folk dances in his European travels and was impressed with the spirituality they inspired in him. He found an established spiritual and ecological community at Findhorn, Scot., and joined the group…

  • Circle Game, The (poetry by Atwood)

    Margaret Atwood: …poetry collections, Double Persephone (1961), The Circle Game (1964, revised in 1966), and The Animals in That Country (1968), Atwood ponders human behaviour, celebrates the natural world, and condemns materialism. Role reversal and new beginnings are recurrent themes in her novels, all of them centred on women seeking their relationship…

  • Circle in the Square Theatre (theatre, New York City, New York, United States)

    José Quintero: …theatrical director and cofounder of Circle in the Square Theatre in New York City’s Greenwich Village, the theatre whose productions sparked the growth of off Broadway into a nationally important theatre movement. Quintero’s stagings of the plays of Eugene O’Neill brought about a worldwide rebirth of interest in O’Neill’s work.

  • Circle K International (American organization)

    Kiwanis International: …International, for high-school students, and Circle K International, for college students. Kiwanis International’s headquarters are located in Indianapolis, Ind.

  • Circle of Animals/Zodiac Heads (art installation by Ai Weiwei)

    Ai Weiwei: Tax evasion allegations and a career retrospective: …in detention, his public installation Circle of Animals/Zodiac Heads, which featured bronze sculptures inspired by the Chinese zodiac, was unveiled in New York City and London. The work had been created for the São Paulo Biennial in 2010.

  • Circle of Chalk, The (play by Klabund)

    Klabund: …renderings include Der Kreidekreis (1924; The Circle of Chalk), a drama that inspired the German playwright Bertolt Brecht to write his play Der kaukasische Kreidekreis (The Caucasian Chalk Circle).

  • circle of confusion (optics)

    aberration: …smallest size known as the circle of least confusion. The image most free of spherical aberration is found at this distance.

  • Circle of Deceit (film by Schlöndorff [1981])

    Volker Schlöndorff: …the film Die Fälschung (1981; Circle of Deceit), made on location in war-torn Beirut; a television production of Arthur Miller’s Death of a Salesman (1985), starring Dustin Hoffman; and well-received adaptations of novels by Marcel Proust (Swann in Love, 1984) and Margaret Atwood (The

  • circle of fifths (music)

    key: The circle of fifths is an efficient way to visualize keys, key signatures, and relationships between keys. Beginning at C, the top position, and proceeding clockwise, the keynotes ascend by perfect fifths (as in the tonic–dominant relationship). Each advance adds a sharp to the key—or, equivalently,…

  • Circle of Friends (novel by Binchy)

    Maeve Binchy: …events that led them there; Circle of Friends (1991; film 1995), about a pair of friends who attend university in Dublin; Tara Road (1998; film 2005), in which two women—one Irish, one American—try to improve their lives by trading houses; Nights of Rain and Stars (2004), a tale of vacationers…

  • Circle of Friends (film by O’Connor [1995])

    Colin Firth: Zero (1988), Valmont (1989), and Circle of Friends (1995).

  • Circle of Reason, The (novel by Ghosh)

    Amitav Ghosh: His first novel, The Circle of Reason (1986), follows an Indian protagonist who, suspected of being a terrorist, leaves India for northern Africa and the Middle East. Blending elements of fable and picaresque fiction, it is distinctly postcolonial in its marginalization of Europe and postmodern in its nonlinear…

  • Circle of Two (film by Dassin [1972])

    Jules Dassin: Blacklist and exile: His last film, Circle of Two (1980), a drama about the relationship between a teenager (Tatum O’Neal) and a much-older painter (Richard Burton), was not well received. It was an unfortunate ending for the career of a resourceful if erratic director whose impact might have been greater had…

  • circle of Willis (anatomy)

    human cardiovascular system: The aorta and its principal branches: …considered as branches of the circle of Willis, which is made up of the two vertebral and the two internal carotid arteries and connecting arteries between them.

  • Circle Repertory Company (American theatrical company)

    Lanford Wilson: …founded the Circle Theater (later Circle Repertory Company), a regional theatre in New York City. Wilson remained involved with Circle Repertory until 1996, when it closed. Wilson achieved commercial success with The Great Nebula in Orion (1971), The Hot l Baltimore (1973; adapted for television 1975), and The Mound Builders…

  • circle school (Muslim education)

    education: Organization of education: …contained several study circles (ḥalqah), so named because the teacher was, as a rule, seated on a dais or cushion with the pupils gathered in a semicircle before him. The more advanced a student, the closer he was seated to the teacher. The mosque circles varied in approach, course…

  • Circle Seven Koran (work by Drew Ali)

    Moorish Science Temple of America: …group’s sacred text was the Holy Koran, which was distinct from the Qurʾān of orthodox Islam and which members considered to have been divinely revealed by Allah to Drew Ali. The work begins with a long narrative spanning from the Fall of Man to the Resurrection of Jesus; it includes…

  • Circle, The (novel by Feinstein)

    Elaine Feinstein: …was preceded by a novel, The Circle (1970).

  • Circle, The (novel by Eggers)

    Dave Eggers: …social media in the novel The Circle (2013), which chronicles the travails of a young initiate at a deceptively utopian technology conglomerate; he later cowrote the script for the film adaptation (2017). Among his other fictional works were Your Fathers, Where Are They? And the Prophets, Do They Live Forever?…

  • Circle, The (film by Panahi [2000])

    Jafar Panahi: …political turn with Dayereh (2000; The Circle), about women in contemporary Iran. Two of the central characters are convicts escaping from prison, which allowed Panahi to point out the irony that they had exchanged their small jail for what some would consider the larger jail that is being a woman…

  • Circle, The (film by Ponsoldt [2017])

    Dave Eggers: …cowrote the script for the film adaptation (2017). Among his other fictional works were Your Fathers, Where Are They? And the Prophets, Do They Live Forever? (2014), a series of dialogues between a disturbed man and the people he kidnaps in an effort to diagnose contemporary societal ills; Heroes of…

  • circle-dividing engine (device)

    surveying: History: The development of the circle-dividing engine about 1775, a device for dividing a circle into degrees with great accuracy, brought one of the greatest advances in surveying methods, as it enabled angle measurements to be made with portable instruments far more accurately than had previously been possible.

  • circling disease (pathology)

    Listeriosis, disease caused by the bacterium Listeria monocytogenes. The bacterium has been isolated from humans and from more than 50 species of wild and domestic animals, including mammals, birds, fish, crustaceans, and ticks. It has also been isolated from environmental sources such as animal

  • circuit (electronics)

    Electric circuit, path for transmitting electric current. An electric circuit includes a device that gives energy to the charged particles constituting the current, such as a battery or a generator; devices that use current, such as lamps, electric motors, or computers; and the connecting wires or

  • circuit (mathematics)

    combinatorics: Directed graphs: A closed path in a directed graph is a sequence of vertices x0x1x2 · · · xn = x0, such that (xi, xi + 1) is a directed edge for i = 0, 1, · · ·, n − 1. To each edge (x, y) of…

  • circuit (Chinese history)

    China: Unification: The empire was divided into circuits, which were units of supervision rather than administration. Within these circuits, intendants were charged with overseeing the civil administration. Below these intendants were the actual administrators. These included prefects, whose positions were divided into several grades according to an area’s size and importance. Below…

  • circuit board (electronics)

    integrated circuit: The final package: …when looking at a computer’s circuit board. The plastic packages have metal connection pins that connect the outside world (such as a computer board) to the proper contact points on the die through holes in the passivation layer.

  • circuit breaker (electrical device)

    Circuit breaker, automatic switch in an electric circuit. Its function is similar to that of a fuse—to open the circuit if abnormal current conditions occur, usually overloads—but it is not destroyed in operation and can be closed again. The simplest circuit breakers are operated by a solenoid that

  • circuit court (government)

    Circuit court, one of many titles for judicial tribunals, usually applied to trial courts of general jurisdiction but occasionally, as with the United States Court of Appeals, to intermediate appellate courts. The title originally referred to a court that made a circuit traveling through the

  • Circuit Court of Appeals Act (United States [1891])

    Supreme Court of the United States: Size, membership, and organization: …this problem, Congress passed the Circuit Court of Appeals Act (1891), which established nine intermediate courts with final authority over appeals from federal district courts, except when the case in question was of exceptional public importance. The Judiciary Act of 1925 (popularly known as the Judges’ Bill), which was sponsored…

  • circuit rider (religion)

    Circuit rider, Methodist ministerial role that was originated in England by John Wesley. The first of the American circuit riders was Robert Strawbridge, who arrived in the colonies in 1764. A few years later Wesley sent missionaries to the American colonies, but most of them departed when

  • circuit riding (United States judicial practice)

    Circuit riding, In the U.S., the act, once undertaken by a judge, of traveling within a judicial district (or circuit) to facilitate the hearing of cases. The practice was largely abandoned with the establishment of permanent courthouses and laws requiring parties to appear before a sitting

  • circuit-switched network (communications)

    telecommunications network: Switched communications network: In a circuit-switched network, a dedicated physical path is established through the network and is held for as long as communication is necessary. An example of this type of network is the traditional (analog) telephone system. A packet-switched network, on the other hand, routes digital data in…

  • Circuits of Peter (early Christian writings)

    Clementine literature: …on an earlier work, the Circuits of Peter, attested by Epiphanius and probably mentioned by the ecclesiastical historian Eusebius of Caesarea and by Origen, the theologian of the Greek church (early 3rd century). The Homilies are important for the information they give on Jewish-Christian heresy in the early centuries of…

  • circulaire Michel (French colonial proclamation)

    Association of Algerian Muslim Ulama: …the French government issued the circulaire Michel, which forbade members of the association from preaching in the mosques. The association, however, did not curtail its activities, even with the arrest of ben Badis in 1938. Sheikh Muḥammad al-Bashīr al-Ibrāhīmī succeeded ben Badis upon his death in 1940. During the Algerian…

  • circular arch bridge (engineering)

    bridge: Roman arch bridges: …famous for using the circular arch form, which allowed for spans much longer than stone beams and for bridges of more permanence than wood. Where several arches were necessary for longer bridges, the building of strong piers was critical. This was a problem when the piers could not be built…

  • circular argument (logic)

    fallacy: Material fallacies: (4) The fallacy of circular argument, known as petitio principii (“begging the question”), occurs when the premises presume, openly or covertly, the very conclusion that is to be demonstrated (example: “Gregory always votes wisely.” “But how do you know?” “Because he always votes Libertarian.”). A special form…

  • circular breathing (music)

    Circular breathing, in music, a technique used by performers on certain wind instruments to maintain a continuous sound. Inhaling only through the nose, the player fills the lungs, then reserves air in the mouth to use in blowing on the instrument. The cheeks often visibly bulge and collapse during

  • circular error of probability (measurement)

    rocket and missile system: Design principles: …usually measured by a missile’s circular error of probability (CEP) and bias. CEP uses the mean point of impact of missile test firings, usually taken at maximum range, to calculate the radius of a circle that would take in 50 percent of the impact points. Bias measures the deviation of…

  • circular error probable (measurement)

    rocket and missile system: Design principles: …usually measured by a missile’s circular error of probability (CEP) and bias. CEP uses the mean point of impact of missile test firings, usually taken at maximum range, to calculate the radius of a circle that would take in 50 percent of the impact points. Bias measures the deviation of…

  • circular function

    Trigonometric function, In mathematics, one of six functions (sine, cosine, tangent, cotangent, secant, and cosecant) that represent ratios of sides of right triangles. They are also known as the circular functions, since their values can be defined as ratios of the x and y coordinates (see

  • circular graph (statistics)

    graph: …part-to-whole relationship by using a circular graph, in which a circle is divided into sections, and where the size, or angle, of each sector is directly proportional to the percentage of the whole it represents. Such a graph would show the same relative population sizes as the bar graph, but…

  • Circular Head (Tasmania, Australia)

    Stanley, town, northwestern Tasmania, Australia. It is situated on the eastern shore of Circular Head, a promontory extending into Bass Strait. From 1826 it was the hub of the settlement of the Van Diemen’s Land Company in that part of the state. First called Circular Head, the town was renamed in

  • circular level (tool)

    hand tool: Plumb line, level, and square: The circular level, in which a bubble floated under a circular glass to indicate level in all directions, was invented in 1777. It lacked the sensitivity of the conventional level.

  • circular motion (physics)

    mechanics: Circular motion: Consider a particle moving along the perimeter of a circle at a uniform rate, such that it makes one complete revolution every hour. To describe the motion mathematically, a vector is constructed from the centre of the circle to the particle. The vector…

  • Circular Mound Altar (temple, Beijing, China)

    Beijing: Public and commercial buildings: …of the enclosure lies the Circular Mound Altar, built in 1530 and rebuilt in 1749. The triple-tiered white stone terrace is enclosed by two sets of walls that are square outside and round inside; thus, the whole structure forms an elaborate and integrated geometric pattern. The inner terrace is 16…

  • circular muscle (anatomy)

    muscle: Muscle in soft animals: …along the body, and the circular fibres encircle it. The body contents are liquids or tissues that can be deformed into different shapes, but they maintain a constant volume. If longitudinal muscles contract and the body shortens, it must widen to accommodate its volume; if the circular muscles contract and…

  • circular orbit (astronomy)

    mechanics: Circular orbits: The detailed behaviour of real orbits is the concern of celestial mechanics (see the article celestial mechanics). This section treats only the idealized, uniform circular orbit of a planet such as Earth about a central body such as the Sun. In fact, Earth’s…

  • circular polarization (optics)

    radiation: Double refraction: Circular polarization is a special case of elliptic polarization in which the so-described ellipse degenerates into a circle.

  • Circular Quay (cove, New South Wales, Australia)

    Sydney: Early settlement: He called it Sydney Cove, for the home secretary. Present-day Sydney Cove is still the city’s heart, though it is now more commonly known as Circular Quay.

  • circular reaction theory (sociology)

    collective behaviour: Interaction theories: …associates collective behaviour with “circular reaction,” a type of interaction in which each person reacts by repeating the action or mirroring the sentiment of another person, thereby intensifying the action or sentiment in the originator. Blumer adds a subtlety to this theory by sharply distinguishing circular reaction from “interpretative…

  • circular saw (tool)

    saw: The portable electric circular saw, with the blade attached to a motor shaft, is probably the most commonly used saw, particularly by home handymen. With the proper blade it can cut almost any material—wood, metals, plastics, fibreglass, cement block, slate, and brick. On wood it can rip, crosscut,…

  • circular temple (architecture)

    Western architecture: Types of public buildings: The Romans built many circular temples. Among the most important remaining examples of these are the temples of Vesta and Mater Matuta in Rome, Vesta at Tivoli, and Venus at Baalbek. The greatest surviving circular temple of antiquity, and in many respects the most important Roman building, is the…

  • circular velocity of money (economics)

    economic stabilizer: Monetary policy: The simplest relationship between income and the demand for money would be: Md = kY. Here, k is a constant. Since Y is a flow (measured per year) and Md a stock (the average stock of money over the year), k has the dimension of a “storage…

  • circular wave (physics)

    sound: Circular and spherical waves: …a two-dimensional plane wave and circular wave. The insightful point suggested by the Dutch physicist Christiaan Huygens is that all the wavelets of Figure 2A and 2B, including those not shown but originating between those that are shown, form a new coherent wave that moves along at the speed of…

  • circulating library

    library: Circulation: …faculties, but the notion of lending, or circulating, libraries did not become popular until the 18th century.

  • circulation (fluid flow)

    fluid mechanics: Potential flow with circulation: vortex lines: The proof of Thomson’s theorem depends on the concept of circulation, which Thomson introduced. This quantity is defined for a closed loop which is embedded in, and moves with, the fluid; denoted by K, it is the integral around the loop of…

  • circulation (architecture)

    architecture: Circulation: Communication among differentiated spaces and between the exterior and the interior may be achieved by openings alone in the simplest plans, but most buildings require distinct spaces allotted to horizontal and vertical circulation (corridors, lobbies, stairs, ramps, elevators, etc.). These are designed by the…

  • circulation (publishing)

    history of publishing: Magazine advertising economics: …are maintained on a falling circulation, it is the advertisers who lose, until they withdraw their support.

  • circulation (anatomy and physiology)

    exercise: Circulatory effects: …also produces changes in the circulation. As previously discussed, muscle endurance training serves to increase blood flow to the working muscles. This increased blood flow means that more oxygen and fuel can be delivered to the muscle cells. The number of red blood cells, which carry oxygen in the blood,…

  • circulation (biological circulaton)

    angiosperm: Evolution of the transport process: This internal circulation, usually called transport, is present in all vascular plants, even the most primitive ones.

  • circulation, atmospheric (meteorology)

    Atmospheric circulation, any atmospheric flow used to refer to the general circulation of the Earth and regional movements of air around areas of high and low pressure. On average, this circulation corresponds to large-scale wind systems arranged in several east–west belts that encircle the Earth.

  • circulation, velocity of (economics)

    economic stabilizer: Monetary policy: The simplest relationship between income and the demand for money would be: Md = kY. Here, k is a constant. Since Y is a flow (measured per year) and Md a stock (the average stock of money over the year), k has the dimension of a “storage…

  • circulatory shock (physiology)

    Shock, in physiology, failure of the circulatory system to supply sufficient blood to peripheral tissues to meet basic metabolic requirements for oxygen and nutrients and the incomplete removal of metabolic wastes from the affected tissues. Shock is usually caused by hemorrhage or overwhelming

  • circulatory system (anatomy)

    Circulatory system, system that transports nutrients, respiratory gases, and metabolic products throughout a living organism, permitting integration among the various tissues. The process of circulation includes the intake of metabolic materials, the conveyance of these materials throughout the

  • Circulifer tenellus (insect)

    curly top: …Europe, and Asia by the beet leafhopper (Circulifer tenullus) and in South America by Agalliana ensigera, which overwinter on wild plant hosts and in the spring migrate to sugar beet fields, their preferred hosts. The disease may be avoided by planting a thick stand as early as possible or when…

  • circulus in probando (logic)

    history of logic: Principia Mathematica and its aftermath: …broader kind resulted from the vicious circle that arises when an object is defined by means of quantifiers whose values include the defined object itself. Russell’s paradox itself incorporates such a self-referring, or “impredicative,” definition; the injunction to avoid them was called by Russell the “vicious circle principle.” It was…

  • Circum-Pacific Belt (seismic belt)

    Ring of Fire, long horseshoe-shaped seismically active belt of earthquake epicentres, volcanoes, and tectonic plate boundaries that fringes the Pacific basin. For much of its 40,000-km (24,900-mile) length, the belt follows chains of island arcs such as Tonga and New Hebrides, the Indonesian

  • Circum-Pacific Mountain System (geology)

    mountain: The Circum-Pacific System: A nearly continuous chain of volcanoes surrounds the Pacific Ocean. The chain passes along the west coast of North and South America, from the Aleutian Islands to the south of Japan, from Indonesia to the Tonga Islands, and to

  • Circum-Pacific Volcano Belt (seismic belt)

    Ring of Fire, long horseshoe-shaped seismically active belt of earthquake epicentres, volcanoes, and tectonic plate boundaries that fringes the Pacific basin. For much of its 40,000-km (24,900-mile) length, the belt follows chains of island arcs such as Tonga and New Hebrides, the Indonesian

  • Circumcelliones (Christian history)

    Donatist: …through the peasant warriors called Circumcellions, they had a program of social revolution combined with eschatological hopes. Martyrdom following a life of penance was the goal of the religiously minded Donatist. Despite almost continuous pressure from successive Roman, Vandal, and Byzantine rulers of North Africa, the Donatist church survived until…

  • circumcision (ritual surgical procedure)

    Circumcision, the operation of cutting away all or part of the foreskin (prepuce) of the penis. The origin of the practice is unknown, although the widespread distribution of circumcision as a ritual suggests great antiquity. Circumcision is generally viewed by anthropologists as a practice through

  • circumdental membrane (anatomy)

    Periodontal membrane, fleshy tissue between tooth and tooth socket that holds the tooth in place, attaches it to the adjacent teeth, and enables it to resist the stresses of chewing. It develops from the follicular sac that surrounds the embryonic tooth during growth. The periodontal membrane c

  • circumference (mathematics)

    sphere: The circumference is the length of any great circle, the intersection of the sphere with any plane passing through its centre. A meridian is any great circle passing through a point designated a pole. A geodesic, the shortest distance between any two points on a sphere,…

  • circumfix (grammar)

    affix: ” A circumfix consists of a prefix and a suffix that together produce a derived or inflected form, as in the English word enlighten. See also morphology.

  • circumlocution (grammar)

    Periphrasis, the use of a longer phrasing in place of a possible shorter form of expression; a roundabout or indirect manner of writing or speaking. In literature periphrasis is sometimes used for comic effect, as illustrated by Charles Dickens in the speech of the character Wilkins Micawber, who

  • circumnavigation (journey)

    Sir Ranulph Fiennes: …led the first north-south surface circumnavigation of the world (i.e., along a meridian).

  • Circumpolar Current (oceanography)

    Antarctic Circumpolar Current, surface oceanic current encircling Antarctica and flowing from west to east. Affected by adjacent landmasses, submarine topography, and prevailing winds, the Antarctic Circumpolar Current is irregular in width and course. Its motion is further complicated by c

  • circumpolar peoples

    Arctic: Ethnic composition: …the general rubric of “circumpolar peoples,” will be included. Inevitably, the criteria for inclusion within this category are somewhat arbitrary, but they include a traditional dependence on hunting, trapping, and fishing and/or the herding of reindeer (rather than other domestic livestock) and the absence or relative insignificance of agriculture.

  • circumpolar vortex (meteorology)

    Polar vortex, large area of persistent low pressure generally located above each of Earth’s polar regions and containing a mass of extremely cold air. The altitude of this cyclone extends from the middle of the troposphere (the lowest level of Earth’s atmosphere, which spans the region from the

  • circumpolar whirl (meteorology)

    Polar vortex, large area of persistent low pressure generally located above each of Earth’s polar regions and containing a mass of extremely cold air. The altitude of this cyclone extends from the middle of the troposphere (the lowest level of Earth’s atmosphere, which spans the region from the

  • circumstance (law)

    crime: China: …depends on the concept of circumstances (e.g., the identity of the accused or the victim, the existence of an official campaign against the particular type of crime involved, or even such matters as whether a robber also beat his victim or showed repentance). Although many countries take such factors into…

  • circumstantial evidence (law)

    Circumstantial evidence, in law, evidence not drawn from direct observation of a fact in issue. If a witness testifies that he saw a defendant fire a bullet into the body of a person who then died, this is direct testimony of material facts in murder, and the only question is whether the witness

  • circumvallate papilla (anatomy)

    human sensory reception: Taste (gustatory) sense: circumvallate (walled-around) papillae of the tongue or in adjacent structures of the palate and throat. Many gustatory receptors in small papillae on the soft palate and back roof of the mouth in adults are particularly sensitive to sour and bitter tastes, whereas the tongue receptors…

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