AskDefine | Define dome

Dictionary Definition

dome

Noun

1 a concave shape whose distinguishing characteristic is that the concavity faces downward
2 informal terms for a human head [syn: attic, bean, bonce, noodle, noggin]
3 a stadium that has a roof [syn: domed stadium, covered stadium]
4 a hemispherical roof

User Contributed Dictionary

English

Pronunciation

Noun

  1. A common structural element of architecture that resembles the hollow upper half of a sphere.
  2. Anything shaped like an upset bowl, often used as a cover, e.g. a cake dome.

Translations

architectural element
anything shaped like an upset bowl

Anagrams

Extensive Definition

A dome is a common structural element of architecture that resembles the hollow upper half of a sphere.

Description

Domes do not have to be perfectly spherical in cross-section, however; a section through a dome may be an ellipse. If the baseline is taken parallel to the shorter of an ellipse's two diameters, a tall dome results, giving a sense of upward reach. A section across the longer axis results in a low dome, capping the volume instead. A very low dome is classified as a saucer dome. All the surfaces of any dome are curved. A spectacular innovation, one that is at the heart of Baroque style, is the oval dome, which gives axial direction and movement to the space beneath it. Though the oval dome is typically identified with churches of Bernini and Borromini, the first oval dome was erected by Vignola for a small chapel, Sant'Andrea in Via Flaminia often called Sant'Andrea del Vignola. Julius III commissioned the dome in 1552 and construction finished the following year. The largest oval dome was built in the basilica of Vicoforte by Francesco Gallo.
Domes that have been disproportionately influential in later architecture are those of the Great Stupa in Sanchi (actually, a solid mound with stone facing), the Pantheon in Rome, Hagia Sophia in Istanbul (or in that time Constantinople), and the Dome of the Rock in Jerusalem. In Western architecture, the most influential domes built since the Renaissance have been those of St. Peter's Basilica in Rome and Jules Hardouin-Mansart's dome at Les Invalides in Paris. The dome of St. Paul's Cathedral in London was the inspiration for the United States Capitol in Washington, which in turn inspired domes of most of the US state capitols.
A cathedral is often referred to as a duomo in Italian or "dom" in German. This is not because so many are crowned with crossing domes over the space where transepts intersect the nave, but instead stemming from the Latin noun "domus", house, or in this case the "domus dei", the house of God. A dome is a mark of palatial ambitions whenever it is seen crowning a residence. The first residential domes were seen in Nero's Domus Aurea that covered the slope of the Palatine Hill, built after the Great Fire of Rome of AD 64 with a lavishness that scandalized the senatorial class.
In the 20th century, thin "eggshell" domes of pre-stressed concrete by architect-engineers such as Nervi opened new directions in fluid vaulted spaces enclosed beneath freeform domed space which now might be supported merely at points rather than in the traditional constricting ring.

Characteristics

A dome can be thought of as an arch which has been rotated around its vertical axis. As such, domes have a great deal of structural strength. A small dome can be constructed of ordinary masonry, held together by friction and compressive forces. Larger domes built after Brunelleschi's dome that triumphantly spanned the crossing of Santa Maria del Fiore, the duomo of Florence, have all been built as double domes, with inner and outer shells. A dome can sit directly on a circular base, however, this is not possible if the base is square. The concave triangular or trapezoidal sections of vaulting that provide the transition between a dome and the square base on which it is set and transfer the weight of the dome are called pendentives. (A less sophisticated version of a pendentive is a squinch.) Under the dome illustrated at left, the pendentives bear circular medallions in bas relief. A pendentive is a constructive device permitting the placing of a circular dome over a square room or an elliptical dome over a rectangular room. The pendentives, which are triangular segments of a sphere, taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base needed for the dome. In masonry the pendentives thus receive the weight of the dome, concentrating it at the four corners where it can be received by the piers beneath. Prior to the pendentive's development, the device of corbelling or the use of the squinch in the corners of a room had been employed. The first attempts at pendentives were made by the Romans, but full achievement of the form was reached only by the Byzantines in Hagia Sophia at Constantinople (6th cent.). In the simple dome the pendentives are part of the same sphere as the dome itself, however such domes are rare. In the more common compound dome the pendentives are part of the surface of a sphere of larger radius than the dome itself but whose center is at a point lower than that of the dome. Another alternative is for a drum to be inserted between the dome and pendentives. Pendentives were commonly used in Byzantine, Renaissance and baroque churches. A half-dome forms the head of an exedra or its smaller version, a niche. In Late Antiquity, the exedra developed into the apse, with separate developments in Romanesque and Byzantine practice.
Many domes are topped by a lantern, a structure with openings (or windows) to admit light in the cupola.
Many sports stadiums are domed, especially in climates that have widely-variable summer and winter weather. The first such stadium was the Astrodome in Houston, Texas. A major improvement to the domed stadium was accomplished with the construction of SkyDome, now Rogers Centre, in Toronto, Ontario, the first domed stadium with a retractable roof.

Saucer dome

A saucer dome is the architectural term used for a low pitched shallow dome which is described geometrically as having a circular base and a segmental (less than a semicircle) section. A section across the longer axis results in a low dome, capping the volume. A very low dome is a saucer dome. Many of the largest existing domes are of this shape.
Gaining in popularity from the 18th century onwards, the saucer dome is often a feature of interior design. When viewed from below it resembles the shallow concave shape of a saucer. The dome itself, being often contained in the space between ceiling and attic, is invisible externally. These domes are usually decorated internally by ornate plaster-work, occasionally they are frescoed.
They are seen occasionally externally in Byzantine churches and mosques. Most of the mosques in India, Pakistan, Iran and Afghanistan have these type of domes.

Onion dome

The onion dome resembles more than half of a sphere, exemplified by Saint Basil's Cathedral in Moscow and the Taj Mahal. They are found mostly in eastern architecture, particularly in Russia, Turkey, India, and the Middle East. An onion dome is a type of architectural dome usually associated with Russian Orthodox churches. Such a dome is larger in diameter than the drum it is set upon and its height usually exceeds its width. These bulbous structures taper smoothly to a point, and strongly resemble the onion, after which they are named.

Domes in buildings of worship

Domes also play a very important part in places of worship where they can represent and symbolise different aspects of the religion. Eastern orthodox churches, for example, have domes which represent heaven. The dome's purpose is to remind people that to gain God's blessing it is necessary to accept salvation through Christ. Domes can also be found in Islamic places of worship, called mosques. In an orthodox church the domes have pictures of Jesus whereas in Islam it is forbidden during worship. Instead, mosques have decorations and patterns on the domes. The domes are tradition in Islam, and another reason for domes is so that the building can be distinguished and others can see where it is even from far.

Cupola

A cupola is a dome-shaped ornamental structure located on top of a larger roof or dome, often used as a lookout or to admit light and provide ventilation. The word derives from the lower Latin cupula (classical Latin cupella from the Greek kupellon), small cup, indicating a vault resembling an upside-down cup.

Famous domes

Listed in order of their completion:

Famous Domes - Undated

McEwan Hall, Edinburgh, Scotland.

Xanadu House

The Xanadu House was a home that used the concept of domes heavily in its shape and design. The home was one of the first non-indigenous homes to use curved surfaces throughout the exterior and interior.

External links

References

dome in Arabic: قبة
dome in Min Nan: Îⁿ-téng
dome in Bosnian: Kupola
dome in Catalan: Cúpula
dome in Czech: Kupole
dome in Welsh: Cromen
dome in Danish: Kuppel
dome in German: Kuppel
dome in Modern Greek (1453-): Τρούλος
dome in Spanish: Cúpula
dome in Esperanto: Kupolo
dome in Persian: گنبد
dome in French: Dôme (architecture)
dome in Korean: 돔
dome in Hindi: गुम्बज
dome in Indonesian: Kubah
dome in Icelandic: Hvolfþak
dome in Italian: Cupola
dome in Hebrew: כיפה (מבנה)
dome in Georgian: კამარა
dome in Latin: Cupola
dome in Hungarian: Kupola
dome in Malay (macrolanguage): Kubah
dome in Dutch: Koepel
dome in Newari: डोम
dome in Japanese: ドーム
dome in Norwegian: Kuppel
dome in Norwegian Nynorsk: Kuppel
dome in Polish: Kopuła (architektura)
dome in Portuguese: Cúpula
dome in Kölsch: Kuppel
dome in Russian: Купол
dome in Simple English: Dome
dome in Slovak: Kupola
dome in Serbian: Купола
dome in Serbo-Croatian: Kupola
dome in Finnish: Kupoli
dome in Swedish: Kupolvalv
dome in Tamil: குவிமாடம்
dome in Thai: โดม
dome in Vietnamese: Kiến trúc vòm
dome in Turkish: Kubbe
dome in Ukrainian: Купол
dome in Chinese: 圓頂

Synonyms, Antonyms and Related Words

antenna tower, apse, arcade, arcature, arch, arched roof, archway, barbican, bean, belfry, bell tower, bend, bend back, bonnet, bow, brow, camber, campanile, cap, ceil, ceilinged roof, coif, colossus, column, concameration, concha, conk, cork, cove, crook, crown, cupola, curl, curve, decurve, deflect, derrick, embow, fire tower, flex, geodesic dome, hat, head, headpiece, hood, hook, hump, hunch, igloo, incurvate, incurve, inflect, keystone, lantern, lighthouse, loop, martello, martello tower, mast, minaret, monument, noddle, noggin, noodle, obelisk, observation tower, ogive, pagoda, pate, pilaster, pillar, pinnacle, pole, poll, pylon, pyramid, recurve, reflect, reflex, retroflex, ridge, roof, roof in, round, sag, sconce, shaft, skewback, skyscraper, span, spire, standpipe, steeple, stopper, stupa, swag, sweep, television mast, tip, top, tope, tour, tower, turn, turret, vault, vaulting, voussoir, water tower, wind, windmill tower
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