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switch
switch electrical device having two states: on, or closed; and off, or open. Ideally a switch offers a zero impedance to a current when it is closed, and it offers infinite impedance when open. Mechanical switches, which operate by moving contacts together and apart, are often classified by the n...
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Bering Strait
Bering Strait c.55 mi (90 km) wide, between extreme NE Asia and extreme NW North America, connecting the Arctic Ocean and the Bering Sea. It is usually completely frozen over from October to June. The Diomede Islands are in the strait. The narrowness of the strait makes it possible for small boat...
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heart-lung machine
heart-lung machine device that maintains the circulation of the blood and the oxygen content of the body when connected with the arteriovenous system; it is also called the pump oxygenator. The machine is used in open-heart surgery when it is necessary to effect a bypass of the circulatory system o...
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Lilith
Lilith , female demon of Jewish mythology, originally probably the Assyrian storm demon Lilitu. In Talmudic tradition many evil attributes were given to this supposedly nocturnal creature. In Jewish folklore she is a vampirelike child-killer and the symbol of sensual lust. Of the various legends con...
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Taiyuan
Taiyuan , city (1994 est. pop. 1,642,300), capital of Shanxi prov., N China, on the Fen River, in one of the world's richest coal and iron areas. It is a mining and smelting center with a large iron and steel complex and plants making heavy machinery, chemicals, plastics, fertilizer, cement, paper p...
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Sea of Azov
Sea of Azov Gr. Maiotis, Lat. Palus Maeotis, ancient Rus. Surozhskoye, northern arm of the Black Sea, c.14,000 sq mi (36,300 sq km), shared by S European Russia and E Ukraine. The shallow sea (maximum depth 45 ft/13 m) is connected with the Black Sea by the Kerch Strait. Its chief arms are th...
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topology
topology branch of mathematics , formerly known as analysis situs, that studies patterns of geometric figures involving position and relative position without regard to size. Topology is sometimes referred to popularly as "rubber-sheet geometry" because a figure can be changed to that of an eq...
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Neva
Neva , river, 46 mi (74 km) long, NW European Russia, connecting Lake Ladoga with the Gulf of Finland, an inlet of the Baltic Sea. St. Petersburg is situated in its delta. The Neva is connected by canal systems with the Volga River and with the White Sea.
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conjunction
conjunction in English, part of speech serving to connect words or constructions, e.g., and, but, and or. Most languages have connective particles similar to English conjunctions. In some languages words, phrases, or clauses may be connected by a suffix added to a word, e.g., - que and - v...
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meat
meat term for the flesh of animals used for food, especially that of cattle, sheep, lambs, and swine, as distinct from game, poultry, and fish; sometimes it is inclusive of all animal flesh. The chief constituents of meat are water, protein, and fat. Phosphorus, iron, and vitamins are also containe...
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