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walls
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Berlin Wall
Berlin Wall 1961-89, a barrier first erected in Aug., 1961, by the East German government along the border between East and West Berlin, and later along the entire border between East Germany and West Germany. At first constructed of barbed wire, the wall was built to halt large numbers of... Read more |
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Wailing Wall
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Great Wall of China
Great Wall of China Defensive frontier and world heritage site, c.2400km (1500mi) long, extending from the Huang Hai (Yellow Sea) to the Central Asian Desert, n China. It is an amalgamation of fortifications constructed by various dynasties. The Warring States built the first sections of the wall.... Read more |
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fortification
fortification system of defense structures for protection from enemy attacks. Fortification developed along two general lines: permanent sites built in peacetime, and emplacements and obstacles hastily constructed in the field in time of war. Ancient and Medieval Fortifications As long as weapons... Read more |
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plastering
plastering house construction technique involving the application of plaster to walls and ceilings, exterior plasterwork being of a different composition and generally known as stucco . Plaster was used by the Egyptians (chiefly as a surface to receive color decorations) and by the Greeks. The... Read more |
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vagina
vagina is the Latin word for ‘sheath’, which makes an interesting comparison with the alternative word for a condom. From this same root, the term ‘invaginated’ means ensheathed, or turned in on itself, like the finger of an empty glove introverted into the space for the... Read more |
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Cell Wall
Cell Wall With very few exceptions, all cells are enveloped by an extracellular matrixcomposed of proteins, carbohydrates, and other substances. Owing to its exceptional strength and its ability to control cell shape, the extracellular matrix of... Read more |
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tree ring
tree ring (annual ring, growth ring) A sheath of cells appearing as one of a series of concentric rings in the cross-section of a woody stem. Each ring is usually the result of a single yearly growth flush starting in spring and ceasing in the late summer. The new wood (xylem) cells arise from... Read more |
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Wall of Antoninus
Wall of Antoninus ancient Roman wall extending across N Britain from the Firth of Forth to the Firth of Clyde. It was built by the Roman governor Lollius Urbicus in the reign of Emperor Antoninus Pius—probably in AD 140-42. Intended as a defense against the peoples to the north, it was built... Read more |
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