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Tunguska

(Encyclopedia)Tunguska to͝on-go͞osˈkə [key], is the name given to the lower course of the Angara River. It flows generally west and joins the Yenisei at Strelka. The area of the three rivers is the home of the...

tunnel

(Encyclopedia)tunnel, underground passage usually made without removing the overlying rock or soil. Although tunnels are approximately horizontal, they must be built with sufficient gradient for proper drainage. Tu...

Turgot, Anne Robert Jacques

(Encyclopedia)Turgot, Anne Robert Jacques än rōbĕrˈ zhäk türgōˈ [key], 1727–81, French economist, comptroller general of finances (1774–76). The son of a rich merchant, he showed precocious ability at s...

Turkmenistan

(Encyclopedia)CE5 Turkmenistan to͞orkmyĕˌnyĭstänˈ [key], republic (2015 est. pop. 5,565,000), 188,455 sq mi (488,100 sq km), central Asia. It borders on Afghanistan and Iran in the south, Uzbekistan in the...

turquoise

(Encyclopedia)turquoise, hydrous phosphate of aluminum and copper, Al2(OH)3PO4·H2O+Cu, used as a gem. It occurs rarely in crystal form, but is usually cryptocrystalline. Turquoise is opaque and has a waxy luster; ...

Twain, Mark

(Encyclopedia)Twain, Mark, pseud. of Samuel Langhorne Clemens, 1835–1910, American author, b. Florida, Mo. As humorist, narrator, and social observer, Twain is unsurpassed in American literature. His novel The Ad...

type

(Encyclopedia)type, for printing, was invented in China (c.1040), using woodblocks. Related devices, such as seals and stamps for making impressions in clay, had been used in ancient times in Babylon and elsewhere....

Uganda

(Encyclopedia)CE5 Uganda yo͞ogänˈdə, o͞ogänˈdä [key], officially Republic of Uganda, republic (2015 est. pop. 37,102,000), 91,133 sq mi (236,036 sq km), E central Africa. It borders on Tanzania and Rwand...

Ukraine

(Encyclopedia)CE5 Ukraine yo͞oˈkrān, yo͞okrānˈ [key], Ukr. Ukraina, republic (2015 est. pop. 44,658,000), 232,046 sq mi (601,000 sq km), E Europe. It borders on Poland in the northwest; on Slovakia, Hungar...

umbilical cord

(Encyclopedia)umbilical cord ŭmbĭlˈĭkəl [key], cordlike structure about 22 in. (56 cm) long in the pregnant human female, extending from the abdominal wall of the fetus to the placenta. Its chief function is t...