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  • Tulu, Derartu (Ethiopian athlete)

    Kenenisa Bekele: …Fatuma Roba, and Bekoji native Derartu Tulu, but his first athletic love was football (soccer). Bekele attended school through the ninth grade, and it was at school that he was introduced to running. He finished fourth in his first race, but in 1998 he won a provincial cross-country title and…

  • Tulu-Malayalam script (writing system)

    Grantha alphabet: ” The Tulu-Malayalam script is a variety of Grantha dating from the 8th or 9th century ad. The modern Tamil script may also be derived from Grantha, but this is not certain.

  • Tuluá (Colombia)

    Tuluá, city, Valle del Cauca departamento, western Colombia. The site, originally settled by the Putimáes Indians, was called Villa de Jerez by early explorers. The Indians resisted all Spanish attempts at conquest from that of Bartolomé Giraldo Gil de Estupi?án in 1556 until subdued by Juan de

  • Tulufan (China)

    Turfan, city, north-central Uygur Autonomous Region of Xinjiang, northwestern China. It lies about 112 miles (180 km) southeast of the city of ürümqi (Urumchi), on the northern edge of the deep Turfan Depression between the Bogda Mountains (an eastern extension of the Tien Shan) to the north and

  • Tulufan Pendi (mountain basin, China)

    Turfan Depression, deep mountain basin in the Uygur Autonomous Region of Xinjiang, northwestern China. The Turfan Depression is a fault trough, descending ultimately to 508 feet (155 metres) below sea level (the lowest point in China), whereas the neighbouring Tarim River and Lop Nur areas are

  • Tulun (Russia)

    Tulun, city, Irkutsk oblast (region), east-central Russia. It lies along the Iya River and the Trans-Siberian Railroad. Incorporated first in 1922, it changed to a rural settlement in 1924 and was reincorporated in 1927. It is a centre for the Azey lignite (brown coal) field and of the wood and

  • ?ūlūn, A?mad ibn (governor of Egypt)

    A?mad ibn ?ūlūn, the founder of the ?ūlūnid dynasty in Egypt and the first Muslim governor of Egypt to annex Syria. As a child A?mad was taken into slavery and placed in the private service of the ?Abbāsid caliph at the new capital of Sāmarrā?. Later he studied theology in the city of Tarsus (now

  • ?ūlūnid dynasty (Egyptian history)

    ?ūlūnid Dynasty, first local dynasty of Egypt and Syria to exist independently of the ?Abbāsid caliphate in Baghdad, ruling 868–905. Its founder, A?mad ibn ?ūlūn, a Turk, arrived in Egypt in 868 as vice governor and promptly (868–872) established a military and financial foothold in the province

  • Tuluva dynasty (Indian history)

    Vijayanagar: … had been supplanted by the Tuluva dynasty. The outstanding Tuluva king was Krishna Deva Raya. During his reign (1509–29) the land between the Tungabhadra and Krishna rivers (the Raichur doab) was acquired (1512), the Orissa Hindus were subdued by the capture of Udayagiri (1514) and other towns, and severe defeats…

  • Tum Teav (Cambodian verse novel)

    Khmer literature: Classical literature: One of the best-known is Tum Teav, a tragic love story believed to be based on real events that occurred during the 17th century. The story was passed down orally and then eventually recorded in the 19th century by the poet Santhor Mok. It remains a widely known story that…

  • Tumaco (Colombia)

    Tumaco, city, Nari?o departamento, southwestern Colombia. It is situated on the Pacific coast, on a small island at the south end of Tumaco Bay. Named for an Indian chief, Tumas, who founded the settlement in 1570, Tumaco experienced prosperity as the point of export for rubber and cinchona bark

  • Tumā?ir bint ?Amr ibn al-?ārith ibn al-Sharīd (Arab poet)

    Al-Khansā?, (Arabic: “The Snub-Nosed”) one of the greatest Arab poets, famous for her elegies. The deaths of two of her kinsmen—her brother Mu?āwiyah and her half-brother ?akhr, both of whom had been tribal heads and had been killed in tribal raids sometime before the advent of Islam—threw

  • Tumak (people)

    Chad: Ethnic groups: …and, like the Gula and Tumak of the Goundi area, are culturally distinct from their Sara neighbours. Along the banks of the Chari and Logone rivers, and in the region between the two rivers, are found the Tangale peoples.

  • tuman (tribe)

    Baloch: Each tribe (tuman) consists of several clans and acknowledges one chief, even though in some tuman there are clans in habitual opposition to the chief.

  • Tuman River (river, Asia)

    Tumen River, river, forming the northeastern frontier of North Korea with China and Russia. The Tumen originates on Mount Paektu (Chinese: Baitou; 9,022 feet [2,750 metres]), the highest peak of the Changbai (Korean: Chanbaek) Mountains along the China-Korea border. It then flows with its short

  • Tuman-gang (river, Asia)

    Tumen River, river, forming the northeastern frontier of North Korea with China and Russia. The Tumen originates on Mount Paektu (Chinese: Baitou; 9,022 feet [2,750 metres]), the highest peak of the Changbai (Korean: Chanbaek) Mountains along the China-Korea border. It then flows with its short

  • Tumasik

    Singapore, city-state located at the southern tip of the Malay Peninsula, about 85 miles (137 kilometres) north of the Equator. It consists of the diamond-shaped Singapore Island and some 60 small islets; the main island occupies all but about 18 square miles of this combined area. The main island

  • Tumba, Lake (lake, Democratic Republic of the Congo)

    Lake Tumba, lake, part of the Congo River basin, northwestern Congo (Kinshasa). Lake Tumba lies 75 miles (120 km) northwest of Lake Mai-Ndombe (formerly Lake Léopold II). It covers 190 square miles (500 square km) and is 6–20 feet (2–6 m) deep. The lake empties into the Congo River by Irebu

  • Tumba, Sven (Swedish ice hockey player and golfer)

    Sven Tumba, (Sven Olof Gunnar Johansson), Swedish ice hockey player and golfer (born May 1, 1931, Stockholm, Swed.—died Oct. 1, 2011, Stockholm), was a legend in Sweden in both ice hockey and golf. He was also an adept association football (soccer) player. Between 1950 and 1966, Tumba (he took the

  • Tumbatu (people)

    Zanzibar: Geography: …Zanzibar Island and the adjacent Tumbatu Island have been occupied by another Bantu-speaking people known as the Tumbatu. These two groups represent the earliest arrivals in Zanzibar. Throughout the 19th century, and after, they were expropriated from the western and more fertile parts of the island by later arrivals, notably…

  • Tumbes (Peru)

    Tumbes, city, northwestern Peru. It is located on the Pacific coastal plain and on high banks overlooking the Tumbes River, 20 miles (30 km) from the Ecuadorian border. In 1532 Francisco Pizarro landed at what is now Puerto Pizarro (the port for Tumbes, 12 miles [19 km] northwest), to begin his

  • Tumbez (people)

    Puná Island: …originally inhabited by the aboriginal Tumbez Indians, whom not even the Inca had conquered. The present population is concentrated around the village of Puná at the island’s northeastern tip. Punta Salinas is a fishing and hunting resort on the southwestern cape.

  • Tumbez (Peru)

    Tumbes, city, northwestern Peru. It is located on the Pacific coastal plain and on high banks overlooking the Tumbes River, 20 miles (30 km) from the Ecuadorian border. In 1532 Francisco Pizarro landed at what is now Puerto Pizarro (the port for Tumbes, 12 miles [19 km] northwest), to begin his

  • Tumbian industry (prehistoric technology)

    Sangoan industry, sub-Saharan African stone tool industry of Acheulean derivation dating from about 130,000 to 10,000 years ago. It is more or less contemporaneous with the Fauresmith industry of southern Africa. The Sangoan industry was discovered in 1920 at Sango Bay, Uganda, and is also found in

  • Tumblagooda Sandstone (geological formation, Australia)

    Silurian Period: Clastic wedges: …belonging to the Upper Silurian Tumblagooda Sandstone were derived from a Precambrian massif called the Yilgarn Block.

  • tumble mustard (plant)
  • tumble windmill grass (plant)

    windmill grass: truncata) and the North American tumble windmill grass (C. verticillata) are perennial species of waste areas. Rhodes grass (C. gayana), a tufted perennial native to South Africa, has been introduced into other areas of the world for forage.

  • tumblebug (insect)

    Dung beetle, (subfamily Scarabaeinae), any of a group of beetles in the family Scarabaeidae (insect order Coleoptera) that forms manure into a ball using its scooperlike head and paddle-shaped antennae. In some species the ball of manure can be as large as an apple. In the early part of the summer

  • tumbler (lock mechanism)

    lock: Development of modern types.: …in England, patented a double-acting tumbler lock. A tumbler is a lever, or pawl, that falls into a slot in the bolt and prevents it being moved until it is raised by the key to exactly the right height out of the slot; the key then slides the bolt. The…

  • tumbler (food processing)

    poultry processing: Tumbling and massaging: A tumbler is a slowly rotating drum that works the meat into a smooth mixture. A massager is a large mixing chamber that contains a number of internal paddles. Cured turkey products (i.e., treated with sodium nitrite), such as turkey ham and turkey pastrami, are often…

  • tumbler switch (electronics)

    electric switch: …of switches; a common type—the toggle, or tumbler, switch—is widely used in home lighting and other applications. The so-called mercury, or “silent,” switch is used extensively for controlling home lighting circuits. The oil switch has its live parts immersed in oil to reduce arcing. The aggregate of switching or circuit-breaking…

  • tumbleweed (plant)

    Tumbleweed, plant that breaks away from its roots and is driven about by the wind as a light rolling mass, scattering seeds as it goes. Examples include pigweed (Amaranth retroflexus, a widespread weed in the western United States) and other amaranths, tumbling mustard, Russian thistle, the steppe

  • Tumbleweed Connection (album by John)

    Elton John: …“Burn Down the Mission” on Tumbleweed Connection (1971) and “Funeral for a Friend/Love Lies Bleeding” on Goodbye Yellow Brick Road (1973). Other notable songs from this period included “Rocket Man” on Honky Chateau (1972) and “Don’t Let the Sun Go Down on Me” on Caribou (1974).

  • Tumbleweeds (film by O’Connor [1999])

    Janet McTeer: …nominations for her roles in Tumbleweeds (1999), as a vagabond single mother, and Albert Nobbs (2011), as a woman who disguises herself as a man in 19th-century Ireland. She appeared in a number of other motion pictures, including the thriller Half Moon Street (1986); Carrington (1995), in which she played…

  • tumbling (gem cutting)

    gemstone: …7 or less) may be tumbled; that is, they may be placed in a cylinder with abrasive grit and water and the cylinder rotated about its long axis. The stones become polished but are irregular in shape. Second, the same kinds of gemstones may instead be cut en cabochon (i.e.,…

  • tumbling (acrobatics)

    Tumbling, execution of acrobatic movements such as rolls, twists, handsprings, or somersaults on floor mats or on the ground. Unlike most other disciplines in gymnastics, tumbling does not involve the use of apparatuses. The activity dates back to ancient China, Egypt, and Greece. Tumbling was

  • tumbling barrel (tool)

    gemstone: …may be placed in a cylinder with abrasive grit and water and the cylinder rotated about its long axis. The stones become polished but are irregular in shape. Second, the same kinds of gemstones may instead be cut en cabochon (i.e., with a rounded upper surface and a flat underside)…

  • tumbling flower beetle (insect)

    Tumbling flower beetle, (family Mordellidae), any of about 1,500 species of beetles (insect order Coleoptera) named for their jumping, turning, and tumbling motion when disturbed or caught. These black beetles are small, usually between 3 and 7 mm (0.1 to 0.3 inch) in length, and are most often

  • Tumbling Tumbleweeds (song by Nolan)

    Gene Autry: …of hit recordings, including “Tumbling Tumbleweeds”(1935) and his signature song, “Back in the Saddle Again” (1939). He recorded more than 600 songs altogether, many of which he wrote or cowrote. By 1940 he was one of the top movie and music stars in the country.

  • Tumblr (Web site)

    David Karp: The site, Tumblr, was launched in private beta in 2006 and to the public in early 2007. It hosted “tumblelogs,” or short-form blogs, of text and various other types of media. Users could make specially formatted posts for photos, videos, audio clips, links, quotes, and chat logs…

  • tumboa (plant)

    Tumboa, common name of Welwitschia mirabilis, a plant species that is the sole member of the family Welwitschiaceae, order

  • Tumboka (people)

    Tumbuka, a people who live on the lightly wooded plateau between the northwestern shore of Lake Nyasa (Lake Mala?i) and the Luangwa River valley of eastern Zambia. They speak a Bantu language closely related to those of their immediate neighbours, the lakeside Tonga, the Chewa, and the Senga. The

  • tumbrel (wagon)

    Tumbrel, French two-wheeled dumpcart or wagon designed to be drawn by a single draft animal. Originally used to carry agricultural supplies, it was most often associated with the cartage of animal manure. It was also used, however, by artillery units to carry tools and ammunition, and during the

  • tumbril (wagon)

    Tumbrel, French two-wheeled dumpcart or wagon designed to be drawn by a single draft animal. Originally used to carry agricultural supplies, it was most often associated with the cartage of animal manure. It was also used, however, by artillery units to carry tools and ammunition, and during the

  • tumbuan (mask)

    Oceanic art and architecture: New Britain: …male (dukduk) and female (tubuan) masks. Both types are cone-shaped and were constructed of cane and fibre. The dukduk is taller than the tubuan and is faceless. The tubuan has circular eyes and a crescent-shaped mouth painted on a dark background. Both masks have short, bushy capes of leaves.

  • Tumbuka (people)

    Tumbuka, a people who live on the lightly wooded plateau between the northwestern shore of Lake Nyasa (Lake Mala?i) and the Luangwa River valley of eastern Zambia. They speak a Bantu language closely related to those of their immediate neighbours, the lakeside Tonga, the Chewa, and the Senga. The

  • Tümed (people)

    Tibet: The Dge-lugs-pa (Yellow Hat sect): …invited to visit the powerful Tümed Mongol leader Altan Khan, with whom he revived the patron-priest relationship that had existed between Kublai Khan and ’Phags-pa. From this time dates the title of Dalai (“Oceanwide”) Lama, conferred by Altan and applied retrospectively to the two previous hierarchs. The holder is regarded…

  • Tumen Jiang (river, Asia)

    Tumen River, river, forming the northeastern frontier of North Korea with China and Russia. The Tumen originates on Mount Paektu (Chinese: Baitou; 9,022 feet [2,750 metres]), the highest peak of the Changbai (Korean: Chanbaek) Mountains along the China-Korea border. It then flows with its short

  • Tumen River (river, Asia)

    Tumen River, river, forming the northeastern frontier of North Korea with China and Russia. The Tumen originates on Mount Paektu (Chinese: Baitou; 9,022 feet [2,750 metres]), the highest peak of the Changbai (Korean: Chanbaek) Mountains along the China-Korea border. It then flows with its short

  • Tumhari Sulu (film by Triveni [2017])

    Vidya Balan: …she had a hit with Tumhari Sulu (2017; “Your Sulu”) and earned a Filmfare Award for her performance in that dramedy. In 2019 Balan appeared in NTR: Kathanayakudu and NTR: Mahanayakudu, both of which were biopics about Indian actor, director, and politician Nandamuri Taraka Rama Rao.

  • Tumkuru (India)

    Tumkuru, city, southeastern Karnataka state, southern India. It lies in an upland region at the foot of Devarayadurga Hill, which has a picturesque health resort at an elevation about 3,900 feet (1,190 metres). The city, a road and rail centre, has a cluster of small-scale industries, which include

  • Tummel, Loch (lake, Scotland, United Kingdom)

    Tummel: Loch Tummel is a popular scenic spot, as are the Falls of Tummel near the confluence of the Rivers Tummel and Garry.

  • Tummel, River (river, Scotland, United Kingdom)

    Tummel, river and loch (lake), Scotland. The River Tummel rises on Rannoch Moor near the southern border of the Highland council area and drains via Loch Laidon through the heavily glaciated east-west valley containing the ribbon lakes (Lochs Rannoch and Tummel, in the Perth and Kinross council

  • tumor (pathology)

    Tumour, a mass of abnormal tissue that arises without obvious cause from preexisting body cells, has no purposeful function, and is characterized by a tendency to independent and unrestrained growth. Tumours are quite different from inflammatory or other swellings because the cells in tumours are

  • tumour (botany)

    Gall, an abnormal, localized outgrowth or swelling of plant tissue caused by infection from bacteria, fungi, viruses, and nematodes or irritation by insects and mites. See black knot; cedar-apple rust; clubroot; crown

  • tumour (pathology)

    Tumour, a mass of abnormal tissue that arises without obvious cause from preexisting body cells, has no purposeful function, and is characterized by a tendency to independent and unrestrained growth. Tumours are quite different from inflammatory or other swellings because the cells in tumours are

  • tumour biomarker (pathology)

    cancer: Molecular evaluation: …Those substances are known as tumour markers. The type and level of a specific tumour marker can provide insight into whether treatment is working and whether a tumour has returned. In general, a rising level of a tumour marker in the blood indicates the regrowth of the tumour. Tumour markers…

  • tumour lysis syndrome (pathology)

    blood disease: Leukemia: …the therapy was associated with tumour lysis syndrome (a sometimes severe metabolic disturbance caused by the dying off of massive numbers of cancer cells), it was hailed at the time of its report in 2011 as a major breakthrough in the treatment of leukemia.

  • tumour marker (pathology)

    cancer: Molecular evaluation: …Those substances are known as tumour markers. The type and level of a specific tumour marker can provide insight into whether treatment is working and whether a tumour has returned. In general, a rising level of a tumour marker in the blood indicates the regrowth of the tumour. Tumour markers…

  • tumour necrosis factor (pathology)

    Tumour necrosis factor (TNF), a naturally occurring protein that is produced in the human body by the phagocytic cells known as macrophages. (The latter can engulf and destroy bacteria, viruses, and other foreign substances.) TNF is produced by macrophages when they encounter the poisonous

  • tumour necrosis factor ligand superfamily member 15 (protein)

    inflammatory bowel disease: …mutation of a gene called TNFSF15 (tumour necrosis factor ligand superfamily member 15), which is involved in suppressing inflammation, has been identified as an ethnic-specific IBD susceptibility gene. In addition, variation of a gene called IL23R (interleukin 23 receptor), particularly in persons of northern European descent, has been associated with…

  • tumour registry (medicine)

    Cancer registry, surveillance system that allows for the collection, storage, and analysis of information on cancer patients. A cancer registry is the chief means by which information is systematically collected about persons diagnosed with cancer. Depending on the resources available, the

  • tumour suppressor gene (pathology)

    Tumour suppressor gene, any of a class of genes that are normally involved in regulating cell growth but that may become cancer-causing when damaged. Tumour suppressor genes encode for proteins that are involved in inhibiting the proliferation of cells, which is crucial to normal cell development

  • tumour-associated antigen (biology)

    cancer: Tumour-associated antigens: Tumour-associated antigens on tumour cells are not qualitatively different in structure from antigens found on normal cells, but they are present in significantly greater amounts. Because of their abundance, they are often shed into the bloodstream. Elevated levels of those antigens can be used…

  • tumour-specific antigen (biology)

    cancer: Tumour-specific antigens: Tumour-specific antigens represent fragments of novel peptides (small proteins) that are presented at the cell surface bound to the major histocompatibility complex class I molecules. In that form they are recognized by T lymphocytes (T cells) and eliminated. The novel peptides are derived from…

  • tumour-treating field therapy (therapeutics)

    mesothelioma: Survival prediction and treatment: Tumour-treating field (TTF) therapy, in which an electric field is used to impair tumour cell division, may be given in combination with certain chemotherapeutic agents to combat malignant pleural mesothelioma.

  • Tumuc-Humac Mountains (mountains, South America)

    Tumuc-Humac Mountains, mountain range that forms the Brazilian border with French Guiana and Suriname. An eastern extension of the Acarai Mountains, the range extends for about 180 miles (290 km) in an east-west direction and attains elevations of 2,800 feet (850 m). The range constitutes part of t

  • Tumuc-Humac, Massif des (mountains, South America)

    Tumuc-Humac Mountains, mountain range that forms the Brazilian border with French Guiana and Suriname. An eastern extension of the Acarai Mountains, the range extends for about 180 miles (290 km) in an east-west direction and attains elevations of 2,800 feet (850 m). The range constitutes part of t

  • Tumucumaque National Park (park, Amapá, Brazil)

    Amapá: In 2002 Tumucumaque National Park—the world’s largest tropical forest park, with an area of about 15,000 square miles (39,000 square km)—was created. The park is part of the Amapá Biodiversity Corridor, a protected area that was established in 2003. The corridor covers more than 70 percent of…

  • Tumucumaque, Serra (mountains, South America)

    Tumuc-Humac Mountains, mountain range that forms the Brazilian border with French Guiana and Suriname. An eastern extension of the Acarai Mountains, the range extends for about 180 miles (290 km) in an east-west direction and attains elevations of 2,800 feet (850 m). The range constitutes part of t

  • tumulus (burial mound)

    Barrow, in England, ancient burial place covered with a large mound of earth. In Scotland, Ireland, and Wales the equivalent term is cairn. Barrows were constructed in England from Neolithic (c. 4000 bc) until late pre-Christian (c. ad 600) times. Barrows of the Neolithic Period were long and

  • Tumulus Culture (European culture)

    history of Europe: The chronology of the Metal Ages: … phases or into the Unetician, Tumulus, and Urnfield cultures. Synchronizations of the more detailed local subdivisions, which were based on typology of metal objects and cross-associations, have employed schemes of Paul Reinecke and Oscar Montelius. Oscar Montelius’ chronology was developed on the basis of Scandinavian bronze objects and resulted in…

  • Tumulus period (Japanese history)

    Tumulus period, early period (c. ad 250–552) of tomb culture in Japan, characterized by large earthen keyhole-shaped burial mounds (kofun) surrounded by moats. The largest of the 71 known tumuli, 1,500 feet (457 m) long and 120 feet (36 m) high, lie in the Nara (Yamato) Basin of Nara prefecture. T

  • Tumut (New South Wales, Australia)

    Tumut, town, southeastern New South Wales, Australia. It lies along the Tumut River, at the northern approach to the Australian Alps. The river valley, explored in 1824 by Hamilton Hume and William Hovell, began to be settled four years later. The town was surveyed in 1848. Its name is derived from

  • Tumut River (river, New South Wales, Australia)

    Tumut River, river, south New South Wales, Australia. It rises on the northwestern slopes of the Snowy Mountains and flows 90 miles (145 km) to join the Murrumbidgee River, east of the town of Gundagai. The Tumut River is a major part of the Snowy Mountains Hydroelectric Project. Its upper r

  • tun (Mayan chronology)

    chronology: Maya and Mexican: …by those years but by tuns (360 days) and their multiples of 20: katuns (20 tuns), baktuns (400 tuns), pictuns (8,000 tuns), calabtuns (160,000 tuns), and kinchiltuns (3,200,000). In practice, the last three were seldom used. The tun comprised 18 uinals, each of 20 kins (days), but these did not…

  • tun (zoology)

    tardigrade: …suspended animation called the “tun” state—in which the body dries out and appears as a lifeless ball (or tun). In this state their metabolism may decline to as little as 0.01 percent of its normal rate. Tardigrades can survive as tuns for years, or even decades, to wait out…

  • Tun Hussein Onn (prime minister of Malaysia)

    Hussein Onn, Malaysian politician and prime minister (1976–81) of a multiracial coalition government. During World War II Hussein fought with the Indian army and with the British forces that in 1945 freed Malaya from Japanese occupation. In 1946 he joined his politician father Onn Bin Jaafar in

  • tun shell (gastropod family)

    gastropod: Classification: …sand; includes helmet shells (Cassidae), tun shells (Doliidae), frog shells (Bursidae), triton shells (Cymatiidae), and fig shells (Ficidae); frog and triton shells often live in rocky areas; most species large in size. Suborder Neogastropoda (Stenoglossa) Carnivorous or scavengers with rachiglossate (with 3 denticles)

  • Tun-huang (work by Inoue Yasushi)

    Inoue Yasushi: …other successes are the novel Tonkō (1959; Tun-huang), which re-created 11th-century China and centred on the Buddhist treasure troves hidden in the Tun-huang (Dunhuang) caves, as well as Hyōheki (1956; “Wall of Ice”), Futo (1963; Wind and Waves), and Saiiki monogatari (1969; Journey Beyond Samarkand). His short stories are collected…

  • Tun-huang (China)

    Dunhuang, city, western Gansu sheng (province), northwestern China. Situated in an oasis in the Gansu-Xinjiang desert region, it is at the far western limit of traditional Chinese settlement along the Silk Road across Central Asia. Dunhuang was the first trading town reached by foreign merchants

  • tuna (fish)

    Tuna, (genus Thunnus), any of seven species of oceanic fishes, some very large, that constitute the genus Thunnus and are of great commercial value as food. They are related to mackerels and are placed with them in the family Scombridae (order Perciformes). Tunas vary considerably, both within and

  • Tuna language

    Melanesian languages: …on Santa Isabel (Ysabel Island); Tolai, a widely used missionary language in New Britain and New Ireland; Yabêm and Graged, lingua francas of the Lutheran Mission in the Madang region of Papua New Guinea; and Mota, a widely used lingua franca and literary language of the Melanesian Mission in northern…

  • Tuna, the (American football coach and executive)

    Bill Parcells, American professional gridiron football coach and executive who coached the New York Giants of the National Football League (NFL) to Super Bowl victories in 1987 and 1991. Parcells spent most of his childhood in New Jersey, where he acquired the nickname “Bill” from teachers who

  • tunable laser

    spectroscopy: Lasers for RIS: …components of RIS methods are tunable lasers, which can be of either the pulsed or the continuous-wave variety. Pulsed lasers are more frequently used since they can add time resolution to a measurement system. In addition, pulsed lasers produce high peak power, permitting the efficient use of nonlinear optics to…

  • tunable oscillator

    electronics: Oscillation: In a tunable oscillator, such as that required for a radio receiver, the parallel combination of an inductor and a capacitor is a tuned circuit: at one frequency, and only one, the inductive effects and the capacitive effects balance. At this frequency the voltage developed across the…

  • ?unb al-Kubrā (island, Persian Gulf)

    Ra?s al-Khaymah: …over the small islands of Greater and Lesser ?unb (?unb al-Kubrā and ?unb al-?ughrā), in the Gulf about 50 miles (80 km) northwest of Ra?s al-Khaymah town; these islands had long been claimed by both Ra?s al-Khaymah and Iran. On Nov. 30, 1971, Iranian troops landed on Greater ?unb and…

  • ?unb al-?ughrā (island, Persian Gulf)

    Ra?s al-Khaymah: …small islands of Greater and Lesser ?unb (?unb al-Kubrā and ?unb al-?ughrā), in the Gulf about 50 miles (80 km) northwest of Ra?s al-Khaymah town; these islands had long been claimed by both Ra?s al-Khaymah and Iran. On Nov. 30, 1971, Iranian troops landed on Greater ?unb and met armed…

  • Tunbridge ware (decorative woodwork)

    Tunbridge Wells: The making of Tunbridge ware—i.e., tables, boxes, and toys made of such veneered hardwoods as beech, sycamore, and cherry—declined during the 20th century. The Tunbridge Wells Museum holds the largest collection of Tunbridge ware in the world. Area borough, 128 square miles (331 square km). Pop. (2001) town,…

  • Tunbridge Wells (district, England, United Kingdom)

    Tunbridge Wells: town and borough (district), administrative and historic county of Kent, southeastern England. It lies about 30 miles (48 km) southeast of London.

  • Tunbridge Wells (England, United Kingdom)

    Tunbridge Wells, town and borough (district), administrative and historic county of Kent, southeastern England. It lies about 30 miles (48 km) southeast of London. The borough encompasses a largely rural area in the southwestern part of Kent. The town of Royal Tunbridge Wells, now included in the

  • Tundi Khel (parade ground)

    Kathmandu: To the east is Tundi Khel, the parade ground, in the centre of which is a stone platform surrounding a tree, from which important government pronouncements were formerly made first to the army. Between it and the city is a tall watchtower built by Bhim Sen Thapa, a former…

  • tundish (metallurgy)

    steel: Tundish, mold, and secondary zone: The key control parameter of continuous casting is matching the flow of liquid steel into the mold with the withdrawal speed of the strand out of the mold. The control of flow rates is accomplished by the tundish, a small,…

  • tundra (ecosystem)

    Tundra, a major zone of treeless level or rolling ground found in cold regions, mostly north of the Arctic Circle (Arctic tundra) or above the timberline on high mountains (alpine tundra). Tundra is known for large stretches of bare ground and rock and for patchy mantles of low vegetation such as

  • tundra climate

    Tundra climate, major climate type of the K?ppen classification characterized by sub-freezing mean annual temperatures, large annual temperature ranges (but not as large as in the adjacent continental subarctic climate), and moderately low precipitation. The tundra climate region occurs between 60°

  • tundra dwarf birch (tree)

    birch: Bog birch (B. glandulosa) of North America, also called tundra dwarf birch or resin birch, and dwarf birch, or dwarf Arctic birch (B. nana), native to most far northern areas of the world, are small alpine and tundra shrubs commonly known as ground birch. Both…

  • tundra polygon (geology)

    glacial landform: Permafrost, patterned ground, solifluction deposits, and pingos: …to their sizes to produce patterned ground. Circular arrangements of the larger rocks are termed stone rings. When neighbouring stone rings coalesce, they form polygonal stone nets. On steeper slopes, stone rings and stone nets are often stretched into stone stripes by slow downhill motion of the soggy active layer…

  • tundra reindeer (mammal)

    reindeer: …are two varieties, or ecotypes: tundra reindeer and forest (or woodland) reindeer. Tundra reindeer migrate between tundra and forest in huge herds numbering up to half a million in an annual cycle covering as much as 5,000 km (3,000 miles). Forest reindeer are much less numerous.

  • tundra swan (bird)

    Whistling swan, (Cygnus columbianus), species of North American swan that calls with a soft musical note. It has a black bill, usually with a small yellow spot near the eye. It breeds in the Arctic tundra and winters in shallow fresh or salt water, especially along eastern and western U.S.

  • Tundra Yukaghir language

    Paleo-Siberian languages: Yukaghir: …about equally into two enclaves: Tundra Yukaghir (also called Northern Yukaghir) in the Sakha republic (Yakutia), near the estuary of the Indigirka River; and Kolyma, or Forest, Yukaghir (also called Southern Yukaghir) along the bend of the Kolyma River. Extinct earlier dialects or languages related to Yukaghir are Omok and…

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