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abacus, in architecture

(Encyclopedia)abacus ăbˈəkəs [key], in architecture, flat slab forming the top member of a capital. In classical orders it varies from a square form having unmolded sides in the Greek Doric, to thinner proporti...

Giralda

(Encyclopedia)Giralda hērälˈdä [key], the famous tower adjoining the Cathedral of Seville, Spain. It was built (1163–84) to serve as minaret to the main mosque of Seville, on the site of which the cathedral n...

matrix

(Encyclopedia)matrix, in mathematics, a rectangular array of elements (e.g., numbers) considered as a single entity. A matrix is distinguished by the number of rows and columns it contains. The matrix CE5 is a 2...

Concorde, Place de la

(Encyclopedia)Concorde, Place de la pläs də lä kôNkôrdˈ [key], large square, Paris, France. It is bounded by the Tuileries gardens; the Champs Élysées; the Seine River; and a facade of buildings divided by ...

shield, armor

(Encyclopedia)shield, piece of defensive armor, worn on the arm or shoulder to ward off weapons during combat, used prior to the dominance of gunpowder. Originally for individual defense during hand-to-hand combat,...

Delany, Samuel R.

(Encyclopedia)Delany, Samuel R. (Samuel Ray Delany, Jr.), 1942–, African-American wrtier, b. Harlem, New York City. Delany uses science fiction, fantasy, and memoir to explore sexual identity, race, language, and...

Capitoline Hill

(Encyclopedia)Capitoline Hill kăpˈĭtəlīnˌ [key] or Capitol, highest of the seven hills of ancient Rome, historic and religious center of the city. The great temple of Jupiter Capitolinus, on its southern summ...

Greenwich Village

(Encyclopedia)Greenwich Village grĕnˈĭch [key], residential district of lower Manhattan, New York City, extending S from 14th St. to Houston St. and W from Washington Square to the Hudson River. North of the mai...

radical, in mathematics

(Encyclopedia)radical, in mathematics, symbol () placed over a number or expression, called the radicand, to indicate a root of the radicand. When used without a sign or index number, as in 4, it designates the pos...

bark, sailing vessel

(Encyclopedia)bark or barque both: bärk [key], sailing vessel with three masts, of which the mainmast and the foremast are square-rigged while the mizzenmast is fore-and-aft-rigged. Although the word was once used...