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/ath'euh nay"sheuhs/, n. Saint, A.D. 296?-373, bishop of Alexandria: opponent of Arianism. * * *
Athanasius I
▪ patriarch of Constantinople born 1230, Adrianople died Oct. 28, 1310, Constantinople       Byzantine monk and patriarch of Constantinople, who directed the ...
Athanasius the Athonite, Saint
▪ Byzantine monk also called  Athanasius Of Trebizond  born c. 920, Trebizond, Asia Minor died c. 1000, Mt. Athos, Greece; feast day May 2       Byzantine monk who ...
Athanasius, Saint
born 293, Alexandria, Egypt died May 2, 373, Alexandria; feast day May 2 Early Christian theologian and staunch opponent of Arianism. He studied philosophy and theology at ...
Ath·a·na·sius (ăth'ə-nāʹshəs), Saint Known as “the Great.” A.D. 293?-373. Greek patriarch of Alexandria and leading defender of Christian orthodoxy against ...
/ath"euh nawr'/, n. Alchemy. a digester furnace with a self-feeding fuel supply contained in a towerlike contrivance, ensuring a constant, durable temperature. [1425-75; late ME
Athapascan or Athapaskan [ath΄ə pas′kən] n., adj. ATHABASKAN * * * Ath·a·pas·can (ăth'ə-păsʹkən) n. Variant of Athabaskan. * * *
/ath'euh pas"keuhn/, n., adj. Athabaskan. Also, Athapascan. * * *
/ath"euhr, -ahr/, n. attar (def. 1). * * *
/euh tahr"veuh vay"deuh, -vee"deuh/, n. Hinduism. one of the Samhitas, a collection of mantras and formulas, some showing pre-Vedic influence. Cf. Veda. * * *
      collection of hymns and incantations that forms part of the ancient sacred literature of India known as the Vedas. See Veda. * * *
/ay"thee iz'euhm/, n. 1. the doctrine or belief that there is no God. 2. disbelief in the existence of a supreme being or beings. [1580-90; < Gk áthe(os) godless + -ISM] * * ...
/ay"thee ist/, n. a person who denies or disbelieves the existence of a supreme being or beings. [1565-75; < Gk áthe(os) godless + -IST] Syn. ATHEIST, AGNOSTIC, INFIDEL, SKEPTIC ...
—atheistically, adv. —atheisticness, n. /ay'thee is"tik/, adj. pertaining to or characteristic of atheists or atheism; containing, suggesting, or disseminating atheism: ...
See atheistic. * * *
/ath"euhl/, n. a male given name. * * *
athel tree
an evergreen tree or large shrub, Tamarix aphylla, native to desert regions of western Asia and northern Africa, having small, pink flowers in terminal clusters, widely planted ...
/ath"euh ling, adh"-/, n. Early Eng. Hist. a man of royal blood; a prince. [bef. 1000; ME; OE aetheling (c. OHG ediling, adalung, OS ethiling), equiv. to aethel(u) noble family ...
▪ hill, England, United Kingdom       small eminence, formerly an island, rising above the drained marshes around the confluence of the Rivers Tone and Parrett in the ...
/ath"euhl stan'/, n. A.D. 895?-940, king of England 925-940. * * * ▪ king of England also spelled  Aethelstan  or  Ethelstan  died October 27, 939  first West Saxon king ...
/ay'thee mat"ik/, adj. inflected without a thematic vowel. [1890-95; A-6 + THEMATIC] * * *
/euh thee"neuh/, n. 1. Also, Athene /euh thee"nee/. Also called Pallas, Pallas Athena. the virgin deity of the ancient Greeks worshiped as the goddess of wisdom, fertility, the ...
/ath'euh nee"euhm, -nay"-/, n. 1. an institution for the promotion of literary or scientific learning. 2. a library or reading room. 3. (cap.) a sanctuary of Athena at Athens, ...
/ath'euh nee"euhs, -nay"-/, n. late 2nd century A.D., Greek philosopher and rhetorician at Naucratis in Egypt. * * * ▪ Greek grammarian and author flourished AD 200, b. ...
Athenaeus of Attaleia
/at'l uy"euh/ Greek physician in Rome, fl. A.D. c40-65. * * *
▪ Greek Christian philosopher and apologist flourished 2nd century AD       Greek Christian philosopher and apologist whose Presbeia peri Christianōn (c. 177; Embassy ...
Athenagoras I
/ath'euh nag"euhr euhs/; Gk. /ah thee'nah gaw"rddahs/, (Aristocles Spyrou) 1886-1972, Archbishop Ecumenical of Constantinople and Ecumenical Patriarch of the Greek Orthodox ...
/ah thee"ne/, n. Greek name of Athens. * * *
/euh thee"nee euhn/, adj. 1. pertaining to Athens, Greece. n. 2. a native or citizen of Athens, Greece. [1580-90; < L Atheni(ensis) of Athens + -AN; see -ENSIS] * * *
/ah'tayn yen"/; Fr. /ann tay nyen"/, n., pl. Athéniennes /ah'tayn yenz"/; Fr. /ann tay nyen"/. a small, decorative stand in the form of an antique tripod, used esp. in France in ...
Athenodorus Cananites
▪ Greek philosopher also called  Athenodorus Son Of Sandon   born c. 74 BC, , Canana, near Tarsus, Cilicia [now in Turkey] died AD 7       Greek Stoic philosopher who ...
▪ Ireland Irish  Baile Átha an Rí (“Town of the King's Ford”)        market town, County Galway, Ireland. It was founded in the 13th century during the ...
/ath"inz/, n. 1. Greek, Athenai. a city in and the capital of Greece, in the SE part. 885,136. 2. Greater, a metropolitan area comprising the city of Athens, Piraeus, and several ...
a·the·o·ret·i·cal (ā'thē-ə-rĕtʹĭ-kəl) adj. Unrelated to or lacking a theoretical basis. * * *
/ath'euh rek"teuh mee/, n., pl. atherectomies. the removal of plaque from an artery by means of a tiny rotating cutting blade inserted through a catheter. [ATHER(OMA) + ...
/ath"euh ruyn', -euhr in/, adj. 1. belonging or pertaining to the family Atherinidae, comprising the silversides. n. 2. an atherine fish. [1760-70; < NL Atherina a genus of the ...
▪ fish Introduction       any member of the order Atheriniformes, containing 15 families of marine and freshwater spiny-finned fishes (spiny-finned fish), including the ...
athermancy [ā thʉr′mən sē] n. 〚< Gr a-, not + thermansis, heating < thermainein, to heat < thermē, heat (see WARM) + -CY〛 the property of not transmitting infrared or ...
a combining form representing atheroma or atheromatous in compound words: atherosclerosis. [ < Gk athér(e) gruel (see ATHEROMA) + -O-] * * *
ath·er·o·gen·e·sis (ăth'ər-ō-jĕnʹĭ-sĭs) n. Formation of atheromatous deposits, especially on the innermost layer of arterial walls.   [atheroma + ...
/ath'euh roh jen"ik/, adj. Pathol. capable of producing atheromatous plaques in arteries. [1950-55; ATHERO- + -GENIC] * * *
See atherogenic. * * *
—atheromatous /ath'euh rom"euh teuhs, -roh"meuh-/, adj. /ath'euh roh"meuh/, n., pl. atheromas, atheromata /-meuh teuh/. Pathol. 1. a sebaceous cyst. 2. a mass of yellowish ...
See atheroma. * * *
See atheromatosis. * * *
—atherosclerotic /ath'euh roh skleuh rot"ik, adh'-/, adj. —atherosclerotically, adv. /ath'euh roh skleuh roh"sis, adh'-/, n. Pathol. a common form of arteriosclerosis in ...
See atherosclerosis. * * *
See atherosclerotic. * * *
/ath"euhr teuhn/, n. Gertrude (Franklin) (Gertrude Franklin Horn), 1857-1948, U.S. novelist. * * * ▪ England, United Kingdom       town in the metropolitan borough of ...
Atherton Tableland
▪ highland region, Australia also called  Atherton Plateau,         highland region that is part of the Great Dividing Range (Eastern Highlands) in northeastern ...
Atherton, Gertrude
▪ American author née  Gertrude Franklin Horn   born Oct. 30, 1857, San Francisco, Calif., U.S. died June 14, 1948, San Francisco  American novelist, noted as an author of ...
—athetosic, athetotic /ath'i tot"ik/, adj. /ath'i toh"sis/, n. Pathol. a condition, chiefly in children, of slow, involuntary, wormlike movements of the fingers, toes, hands, ...
Athey, Susan
▪ 2008 Susan Carleton Athey  born Nov. 29, 1970, Boston, Mass.  On April 20, 2007, Susan Athey of Harvard University became the first woman to win the John Bates Clark (JBC) ...
Athínai [ä thē′ne] Gr. name for ATHENS * * *
/euh therrst"/, adj. 1. having a keen desire; eager (often fol. by for): She has long been athirst for European travel. 2. Archaic. thirsty. [bef. 1000; ME athurst, ofthurst, OE ...
▪ France       town, southern suburb of Paris, in Essonne département, Île-de-France région, northern France. Athis-Mons lies near the confluence of the Orge and ...
/ath"leet/, n. a person trained or gifted in exercises or contests involving physical agility, stamina, or strength; a participant in a sport, exercise, or game requiring ...
athlete's foot
Pathol. a contagious disease, caused by a fungus that thrives on moist surfaces; ringworm of the feet. [1925-30, Amer.] * * * Form of ringworm that affects the feet. In the ...
athlete's heart
nonpathological enlargement of the heart resulting from intensive aerobic exercise. Also, athletic heart. * * *
ath·lete's foot (ăthʹlēts) n. A contagious fungal skin infection caused by a species of Trichophyton or Epidermophyton that usually affects the feet, especially the skin ...
—athletically, adv. —athleticism /ath let"euh siz'euhm/, n. /ath let"ik/, adj. 1. physically active and strong; good at athletics or sports: an athletic child. 2. of, like, ...
athletic shoe
1. a shoe designed to be worn for sports, exercising, or recreational activity, as racquetball, jogging, or aerobic dancing. 2. sneaker (def. 1). * * *
athletic supporter
jockstrap. [1925-30] * * *
See athletic. * * *
athleticism [ath let′ə siz΄əm] n. physical prowess consisting variously of coordination, dexterity, vigor, stamina, etc. * * * See athletically. * * *
/ath let"iks/, n. 1. (usually used with a pl. v.) athletic sports, as running, rowing, or boxing. 2. Brit. track-and-field events. 3. (usually used with a sing. v.) the practice ...
athletic supporter n. An elastic support for the male genitals, worn especially in athletic or other strenuous activity. Also called jockstrap. * * *
▪ town and district, Ireland Irish  Baile Átha Luain   town, County Westmeath, Ireland. It lies on the River Shannon just south of Lough (lake) Ree. Located at a major ...
Athlone, Godard van Reede, 1st earl of, baron of Aughrim, Heer van Ginkel
▪ Dutch soldier born June 14 [June 4, Old Style], 1644, Utrecht, Netherlands died February 11, 1702/03, Utrecht       Dutch soldier in English service who completed the ...
/ath"euh did/, n. a ramjet. [1925-30; a(ero)- th(erm)ody(namic) d(uct)] * * *
/ath"awl, -euhl/, n. 1. a city in central Massachusetts. 10,634. 2. a male given name. * * * ▪ Massachusetts, United States       town (township), Worcester county, ...
▪ mountain region, Scotland, United Kingdom       mountainous traditional region covering approximately 450 square miles (1,165 square km) in northern Perth and Kinross ...
Atholl, John Murray, 2nd earl and 1st marquess of, earl of Tullibardin, viscount of Balquhidder, Lord Murray, Balvany, and Gask
▪ Scottish Royalist born May 2, 1631 died May 6, 1703       a leading Scottish Royalist and defender of the Stuarts from the time of the English Civil Wars (1642–51) ...
Atholl, John Murray, 2nd marquess and 1st duke of, marquess of Tullibardin, earl of Strathtay and Strathardle, viscount of Balwhidder, Glenalmond, and Glenlyon, Lord Murray, Balvenie, and Gask
▪ Scottish noble born February 24, 1660, Knowsley, Lancashire, England died November 14, 1724, Huntingtower, Perth, Scotland       a leading Scottish supporter of ...
Atholl, John Stewart, 4th Earl of
▪ Scottish noble died April 24/25, 1579, Kincardine Castle, near Auchterarder, Perthshire, Scot.       Roman Catholic Scottish noble, sometime supporter of Mary, Queen ...
/ath"euh nuyt'/, adj. of or relating to Mount Athos. [1885-90; < L Athon-, s. of Athos ( < Gk Athós ATHOS) + -ITE1] * * *
/ath"ohs, ay"thos/; Gk. /ah"thaws/, n. Mount 1. the easternmost of three prongs of the peninsula of Chalcidice, in NE Greece: site of an autonomous theocracy constituted of 20 ...
Athos, Mount
Athos, Mount [ath′äs, ā′thäs] 1. autonomous monastic district occupying the tip of the easternmost prong of the Chalcidice peninsula, NE Greece: 130 sq mi (337 sq km); ...
Ath·os (ăthʹŏs, āʹthŏs, äʹthôs), Mount A peak, about 2,034 m (6,670 ft) high, of northeast Greece. It is the site of the virtually independent monastic community of ...
/euh thril"/, adj. affected with a sudden wave of keen emotion or excitement; tingling (usually used predicatively): After the first surprise, he found himself athrill with a ...
—athrocytosis, n. /ath"reuh suyt'/, n. Cell Biol. a cell that ingests foreign particles and retains them in suspension in the cytoplasm. [1935-40; < Gk (h)athró(os) gathered ...
/euh thwawrt"/, adv. 1. from side to side; crosswise. 2. Naut. a. at right angles to the fore-and-aft line; across. b. broadside to the wind because of equal and opposite ...
/euh thwawrt"ships'/, adv. Naut. from one side of a ship to the other. [1710-20; ATHWART + SHIP + -S1] * * *
/euh tilt"/, adj., adv. 1. with a tilt or inclination; tilted: Hold the bottle slightly atilt. 2. with the lance in hand in tilting. [1555-65; A-1 + TILT1] * * *
/euh ting"geuhl/, adj. tingling; stimulated. [1850-55; A-1 + TINGLE] * * *
/euh tip"toh'/, adv., adj. 1. standing or walking on tiptoe (usually used predicatively). 2. eagerly expectant, as anticipating a desired event or arrival: waiting atiptoe for ...
A·ti·rau (äʹtē-rou') See Atyrau. * * *
▪ Buddhist religious reformer also called  Dīpaṅkara   born 982 died 1054, Nyethang, Tibet [now Nyetang, China]       Indian Buddhist reformer whose teachings ...
/ah'tee tlahn"/, n. Lake, a crater lake in SW Guatemala, 4700 ft. (1433 m) above sea level. ab. 53 sq. mi. (137 sq. km). * * *
Atitlán, Lake
Lake, southwestern Guatemala. It lies at an elevation of about 4,700 ft (1,430 m) in the central highlands. Occupying a crater some 1,000 ft (300 m) deep, the lake is 12 mi (19 ...
▪ island, Cook Islands, Pacific Ocean       one of the southern Cook Islands, a self-governing state in free association with New Zealand in the South Pacific Ocean. A ...
At·i·van (ătʹə-văn') A trademark used for the drug lorazepam. * * *
Atiyah, Sir Michael Francis
▪ British mathematician born April 22, 1929, London, England    British mathematician who was awarded the Fields Medal in 1966 primarily for his work in topology. Atiyah ...
/ach'euh neez", -nees"/, n., pl. Atjehnese for 1. 1. a member of an indigenous Muslim people of northernmost Sumatra. 2. the Austronesian language spoken by the Atjehnese. Also, ...
Atka mackerel
/at"keuh/ a black-banded mackerel, Pleurogrammus monopterygius, of northern Pacific seas. [1890-95; named after Atka, an island in SW Alaska near the fishing grounds] * * *
At·ka Island (ătʹkə, ätʹ-) An island of southwest Alaska in the Andreanof group of the central Aleutian Islands. It was the site of a major U.S. military base during ...
Atka mackerel n. A food fish (Pleurogrammus monopterygius) native to northern Pacific waters. * * *
/at"kinz/, n., pl. Atkins for 2. 1. Chester ("Chet"), born 1924, U.S. country-and-western singer and musician. 2. See Tommy Atkins. * * *
Atkins Diet{™}
a weight loss programme developed by Dr Robert Atkins (1930–2003) which involves restricting the amount of carbohydrates, such as bread, pasta, etc, that you eat and replacing ...
Atkins, Anna
▪ English photographer original name  Anna Children  born March 16, 1799, Tonbridge, Kent, Eng. died June 9, 1871, Halstead Place, Kent       English photographer ...
Atkins, Chet
orig. Chester Burton Atkins born June 20, 1924, Luttrell, Tenn., U.S. died June 30, 2001, Nashville, Tenn. U.S. guitarist and record company executive. Atkins began his ...
Atkins, Cholly
▪ 2004 Charles Sylvan Atkinson        American dancer and choreographer (b. Sept. 30, 1913, Pratt City, Ala.—d. April 19, 2003, Las Vegas, Nev.), created the ...
Atkins, Robert Coleman
▪ 2004       American cardiologist and nutritionist (b. Oct. 17, 1930, Columbus, Ohio—d. April 17, 2003, New York, N.Y.), wrote seven best-selling diet ...
/at"kin seuhn/, n. 1. Sir Harry Albert, 1831-92, New Zealand statesman, born in England: prime minister 1876-77, 1883-84, 1887-91. 2. (Justin) Brooks, 1894-1984, U.S. drama ...
Atkinson, Rowan Sebastian
▪ 1997       It is no surprise that a painfully shy person would hide behind a mask, but it can be highly risky to borrow that mask's main features from a gargoyle. Such ...
Atkinson, Sir Harry
▪ prime minister of New Zealand in full  Sir Harry Albert Atkinson   born Nov. 1, 1831, Broxton, Cheshire, Eng. died June 28, 1892, Wellington, N.Z.       statesman ...
Atkinson, Theodore Frederick
▪ 2006       American jockey (b. June 17, 1916, Toronto, Ont.—d. May 5, 2005, Beaver Dam, Va.), became the first jockey to win more than a million dollars in earnings ...
Atl abbrev. Atlantic * * *
Atl, Doctor
▪ Mexican painter and writer pseudonym of  Gerardo Murillo  born October 3, 1875, Guadalajara, Mexico died August 15, 1964, Mexico City       painter and writer who ...
Atlantic. * * *
/at lan"teuh/, n. a city in and the capital of Georgia, in the N part. 425,022. * * * I City (pop., 2000: 416,474; metro. area pop.: 4,112,198), capital of Georgia, U.S. Lying ...
Atlanta Braves
▪ American baseball team  American professional baseball team based in Atlanta. The team is the only existing major league franchise to have played every season since ...
Atlanta Campaign
Important series of battles in the American Civil War in Georgia (May–September 1864). Though most of the battles ended in draws, they eventually cut off the main Confederate ...
Atlanta Compromise
Classic statement on race relations by Booker T. Washington, made in a speech at the Atlanta Exposition (1895). He asserted that vocational education, which gave blacks a chance ...
Atlanta Hawks
▪ American basketball team  American professional basketball team based in Atlanta. The Hawks were one of the original franchises of the National Basketball Association ...
Atlanta Journal-Constitution
Daily morning newspaper published in Atlanta, Ga. , based largely on the former Atlanta Constitution. Generally regarded as the "voice of the New South," the Constitution ...
Atlanta Journal-Constitution, The
▪ American newspaper       morning daily newspaper published in Atlanta, Ga., and based largely on the former Atlanta Constitution following its merger with the Atlanta ...
/at lan"tl/, adj. Anat. of or pertaining to the atlas. [1795-1805; < NL atlant- (see ATLANTIC) + -AL1] * * *
See Atlanta. * * *
/at'lan tee"euhn, -leuhn-/, adj. 1. pertaining to the demigod Atlas. 2. having the strength of Atlas: He was of monumental girth and Atlantean power. 3. pertaining to ...
/at lan"teez/, n. pl. of atlas (def. 5). * * *
/at lan"tik/, adj. 1. of or pertaining to the Atlantic Ocean. 2. of, pertaining to, or situated on the eastern seaboard of the U.S.: the Atlantic states. 3. of or pertaining to ...
Atlantic Charter
the joint declaration of President Roosevelt and Prime Minister Churchill (August 14, 1941) resulting from a conference at sea, setting forth the peace aims of their governments ...
Atlantic City
a city in SE New Jersey: seashore resort. 40,199. * * * City (pop., 2000: 40,517) and resort, southeastern New Jersey, U.S. Lying on narrow Absecon Island, the resort began to ...
Atlantic Coast Conference
▪ American athletic organization       American collegiate athletic organization formed in 1953 as an offshoot of the Southern Conference. Member schools are Boston ...
Atlantic croaker.
See under croaker (def. 2). [1945-50] * * *
Atlantic Intracoastal Waterway
Navigable route, coastal eastern U.S. Authorized by Congress in 1919 to provide sheltered passage for both commercial shipping and pleasure craft, and constructed by the Army ...
Atlantic Intracoastal Waterway.
See under Intracoastal Waterway. * * *
Atlantic languages
formerly West Atlantic languages Branch of the Niger-Congo language family. Atlantic comprises some 45 languages spoken by some 30 million people living mainly in Senegal, The ...
Atlantic Monthly
a US magazine known for its intelligent writing on culture and modern life. It is published in Boston, where it began in 1857 as a ‘journal of literature, politics, science, ...
Atlantic Monthly, The
Monthly journal of literature and opinion, one of the oldest and most respected of U.S. reviews. Published in Boston, it was founded in 1857 by Moses Dresser Phillips. It soon ...
Atlantic Ocean
an ocean bounded by North America and South America in the Western Hemisphere and by Europe and Africa in the Eastern Hemisphere. ab. 31,530,000 sq. mi. (81,663,000 sq. km); with ...
Atlantic Pact.
See North Atlantic Treaty. * * *
Atlantic Provinces
the Canadian provinces bordering the Atlantic Ocean, comprising New Brunswick, Newfoundland, Nova Scotia, and Prince Edward Island. * * *
Atlantic puffin.
See under puffin. * * *
Atlantic Richfield Company
▪ American oil company       American petroleum corporation created in 1966 by the merger of Richfield Oil Corporation and Atlantic Refining Company. A further merger in ...
Atlantic ridley
ridley (def. 1). * * *
Atlantic salmon
a valuable food and game fish, Salmo salar, mainly of northern coastal Atlantic waters or, when spawning, in freshwater streams tributary to the ocean. [1900-05] * * * Oceanic ...
Atlantic Standard Time
Atlantic Standard Time n. a standard time used in the zone which includes Bermuda, Nova Scotia, New Brunswick, and E Quebec, corresponding to the mean solar time of the 60th ...
Atlantic time.
See under standard time. Also called Atlantic Standard Time. [1905-10] * * *
Atlantic, Battle of the
Contest in World War II between Britain (and later the U.S.) and Germany for the control of Atlantic sea routes. Initially the Anglo-French coalition drove German merchant ...
Atlantic City A city of southeast New Jersey on the Atlantic Ocean. It is a popular resort and convention center with a famous boardwalk. Legalized gambling was introduced in ...
Atlantic croaker n. A small silvery food fish (Micropogonias undulatus) common in Atlantic waters south of Massachusetts. * * *
AtlanticIntracoastal Waterway
Atlantic Intracoastal Waterway A system of inland waterways including rivers, bays, and canals along the Atlantic coast of the United States. It extends from Cape Cod to ...
At·lan·ti·cism (ăt-lănʹtĭ-sĭz'əm) n. A doctrine of cooperation among western European and North American nations regarding political, economic, and defense ...
—Atlanticism, n. /at lan"teuh sist/, n. a supporter of close military, political, and economic cooperation between Western Europe and the U.S. [1965-70; ATLANTIC + -IST] * * *
▪ department, Colombia       departamento, northwestern Colombia, located on the Caribbean coastal plain and bounded east by the Magdalena River. The department was ...
Atlantic Ocean The world's second-largest ocean, divided into the North Atlantic and the South Atlantic. It extends from the Arctic in the north to the Antarctic in the south ...
Atlantic Provinces The eastern Canadian provinces of New Brunswick, Prince Edward Island, Nova Scotia, and Newfoundland. * * *
Atlantic salmon Salmo salar Elizabeth Morales n. A species of salmon (Salmo salar) native to northern Atlantic waters and valued as a food fish. * * *
AtlanticStandard Time
Atlantic Standard Time n. Abbr. AST Standard time in the fourth time zone west of Greenwich, England, reckoned at 60° west and used, for example, in Puerto Rico and the Canadian ...
/at lan"tis/, n. a legendary island, first mentioned by Plato, said to have existed in the Atlantic Ocean west of Gibraltar and to have sunk beneath the sea, but linked by some ...
Atlantis II Deep
▪ basin, Red Sea       submarine basin, the largest in the Red Sea, located at latitude 21°23′ N and longitude 38°04′ E. The Atlantis II Deep attains a maximum ...
/at"leuhs/, n., pl. atlases for 1-3, atlantes /at lan"teez/ for 5. 1. a bound collection of maps. 2. a bound volume of charts, plates, or tables illustrating any subject. 3. ...
/at"leuhs/, n., pl. Atlases for 2, 4. 1. Class. Myth. a Titan, son of Iapetus and brother of Prometheus and Epimetheus, condemned to support the sky on his shoulders: identified ...
Atlas cedar
an evergreen tree, Cedrus atlantica, native to northern Africa, having in its widely cultivated forms bluish-green leaves and light-brown cones. * * *
Atlas Mountains
a mountain range in NW Africa, extending through Morocco, Algeria, and Tunisia. Highest peak, Mt. Tizi, 14,764 ft. (4500 m). * * * Mountain system, northwestern Africa. It ...
Atlas rocket
Any of a series of U.S. expendable space launch vehicles. The Atlas was originally designed as a liquid-fueled ICBM and first tested in an operational version in 1959. Early ...
Atlas, Charles
orig. Angelo Siciliano born Oct. 30, 1893, Acri, Italy died Dec. 24, 1972, Long Beach, N.Y., U.S. Italian-born U.S. bodybuilder. Atlas immigrated to the U.S. at age 10. In ...
Atlas cedar n. A northern African evergreen tree (Cedrus atlantica), having green to silvery-blue foliage and widely grown as an ornamental.   [After the Atlas Mountains.] * * *
Atlas Mountains A system of ranges and plateaus of northwest Africa extending from southwest Morocco to northern Tunisia between the Sahara Desert and the Mediterranean Sea and ...
/aht"laht'l/, n. Archaeol. spear-thrower (def. 2). [1870-75; < Nahuatl ahtlatl] * * *
/aht"lee/, n. Scand. Legend. Attila, king of the Huns: represented in the Volsunga Saga as the brother of Brynhild and the second husband of Gudrun, whose brothers he killed in ...
Atli, Lay of
▪ medieval poem Norse  Atlakvida        heroic poem in the Norse Poetic Edda (see Edda), an older variant of the tale of slaughter and revenge that is the subject of ...
▪ Mexico       city, southwestern Puebla estado (state), south-central Mexico. It lies at 6,171 feet (1,881 m) above sea level in a fertile valley irrigated by the ...
See automated-teller machine. * * *
1. atmosphere; atmospheres. 2. atmospheric. * * *
/aht"meuhn/, n. Hinduism. 1. the principle of life. 2. the individual self, known after enlightenment to be identical with Brahman. 3. (cap.) the World Soul, from which all ...
a combining form meaning "air," used in the formation of compound words: atmosphere. [ < Gk, comb. form of atmós vapor, smoke] * * *
/at mol"euh sis/, n., pl. atmolyses /-seez'/. a process for separating gases or vapors of different molecular weights by transmission through a porous substance. [1865-70; ATMO- ...
/at mom"i teuhr/, n. an instrument for measuring the rate at which water evaporates. Also called evaporimeter. [1805-15; ATMO- + -METER] * * *
See atmometer. * * *
/at mom"i tree/, n. the science of measuring the rate at which water evaporates. [ATMO- + -METRY] * * *
/at"meuh fuyl'/, Geol. adj. 1. (of a chemical element in the earth) having an affinity for the atmosphere, as neon or helium. n. 2. an atmophile element. [ATMO- + -PHILE] * * *
▪ Alabama, United States       city, Escambia county, southwestern Alabama, U.S. It lies just north of the Florida state line, about 50 miles (80 km) northeast of ...
Atmos clock
/at"meuhs/, Trademark. a brand of self-winding clock utilizing variations of temperature acting on a mercury thermometer to create an imbalance within the winding drum. * * *
—atmosphereless, adj. /at"meuhs fear'/, n., v., atmosphered, atmosphering. n. 1. the gaseous envelope surrounding the earth; the air. 2. this medium at a given place. 3. ...
atmosphere saffir-simpson
▪ Table Saffir-Simpson hurricane scale* category wind speed storm surge damage mph km/hr feet metres 1 74-95 119-154 4-5 1.2-1.5 damage primarily to shrubs, trees, and ...
atmosphere w n pacific
▪ Table Typhoon names for the western North Pacific Ocean and the South China Sea* contributing countries cycle I cycle II cycle III cycle IV cycle ...
atmosphere, evolution of
Introduction  the development of Earth's (Earth) atmosphere across geologic time. The process by which the current atmosphere arose from earlier conditions is complex; ...
at·mo·spher·i·a n. Plural of atmospherium. * * *
—atmospherically, adv. /at'meuhs fer"ik, -fear"-/, adj. 1. pertaining to, existing in, or consisting of the atmosphere: atmospheric vapors. 2. caused by, produced by, or ...
Atmospheric abundances for Jupiter
▪ Table Atmospheric abundances for Jupiter gas percent element measured (relative to hydrogen) Jupiter/Sun ratio Equilibrium species hydrogen (H2) 86.4 helium ...
atmospheric boundary layer.
See surface boundary layer. * * *
atmospheric braking
Rocketry. a technique of reentry in which the vehicle is maneuvered in the upper atmosphere so as to lose velocity by utilizing drag without overheating. * * *
atmospheric circulation
▪ meteorology       any atmospheric flow used to refer to the general circulation of the Earth and regional movements of air around areas of high and low pressure. On ...
atmospheric corona
▪ meteorology       set of one or more coloured rings that sometimes appear close to the sun or moon when they are viewed through a thin cloud composed of water ...
atmospheric electricity
static electricity produced by charged particles in the atmosphere. * * *
atmospheric engine
an early form of single-acting engine in which the power stroke is provided by atmospheric pressure acting upon a piston in an exhausted cylinder. [1815-25] * * *
atmospheric inversion
Meteorol. inversion (def. 12). * * *
atmospheric perspective.
See aerial perspective. * * *
atmospheric pressure
Meteorol. 1. the pressure exerted by the earth's atmosphere at any given point, being the product of the mass of the atmospheric column of the unit area above the given point and ...
atmospheric refraction
      change in the direction of propagation of electromagnetic radiation or sound waves in traversing the atmosphere. Such changes are caused by gradients in the density ...
atmospheric science
 interdisciplinary field of study that combines the components of physics and chemistry that focus on the structure and dynamics of Earth's atmosphere. Mathematical tools, ...
atmospheric tide
Meteorol. a movement of atmospheric masses caused by the gravitational attraction of the sun and moon and by daily solar heating. [1825-35] * * *
atmospheric turbulence
▪ meteorology       small-scale, irregular air motions characterized by winds that vary in speed and direction. Turbulence is important because it mixes and churns the ...
atmospheric window
Astron. any of the wavelengths at which electromagnetic radiation from space can penetrate the earth's atmosphere. [1965-70] * * *
See atmospheric. * * *
atmospheric pressure n. Pressure caused by the weight of the atmosphere. At sea level it has a mean value of one atmosphere but reduces with increasing altitude. * * *
/at'meuhs fer"iks, -fear"-/, n. 1. (used with a pl. v.) Radio and Television. noise in a radio receiver or randomly distributed white spots or bands on the screen of a television ...
at·mo·spher·i·um (ăt'mə-sfîrʹē-əm) n. pl. at·mo·spher·i·a (-ē-ə) An optical device designed to project images of atmospheric phenomena, such as clouds, on the ...
/aht"neuh/, n. Ahtna. * * *
/at"awl, -ol, -ohl, euh tawl", euh tol", euh tohl"/, n. a ring-shaped coral reef or a string of closely spaced small coral islands, enclosing or nearly enclosing a shallow ...
/at"euhm/, n. 1. Physics. a. the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and ...
atom bomb
atom bomb n. ATOMIC BOMB atom-bomb vt. * * *
atom bomb.
See atomic bomb. [1940-45] * * *
atom smasher
Physics. accelerator (def. 7). [1935-40] * * *
/at"euhm bom"/, v.t. 1. to bomb (a target) with an atomic bomb. v.i. 2. to atom-bomb a target. [1940-45] * * *
atom bomb n. 1. An explosive weapon of great destructive power derived from the rapid release of energy in the fission of heavy atomic nuclei, as of uranium 235. Also called ...
—atomically, adv. /euh tom"ik/, adj. 1. of, pertaining to, resulting from, or using atoms, atomic energy, or atomic bombs: an atomic explosion. 2. propelled or driven by atomic ...
atomic age
the period in history initiated by the first use of the atomic bomb and characterized by atomic energy as a military, political, and industrial factor. [1940-45] * * *
atomic bomb
1. a bomb whose potency is derived from nuclear fission of atoms of fissionable material with the consequent conversion of part of their mass into energy. 2. a bomb whose ...
atomic clock
an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium. [1935-40] * * * ▪ ...
atomic cocktail
Informal. an oral dose of a radioactive substance used in the treatment or diagnosis of cancer. * * *
atomic disintegration
atomic disintegration n. a process resulting in the change of a radioactive nucleus, either by emission of an alpha, beta, or gamma ray or by fission, and producing a change in ...
atomic energy
atomic energy n. NUCLEAR ENERGY * * *
Atomic Energy Commission
a former federal agency (1946-75) created to regulate the development of the U.S. atomic energy program: functions transferred to the Nuclear Regulatory Commission. Abbr.: AEC * ...
atomic energy.
See nuclear energy. [1905-10] * * *
atomic hydrogen
Chem. hydrogen in the form of single atoms, rather than molecules, which makes it extremely reactive. Also called active hydrogen. * * *
atomic mass
Chem. the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1/16 the mass of one oxygen atom, but after ...
atomic mass unit
Physics. 1. Also called dalton. a unit of mass, equal to 1/12 the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles. 2. (formerly) a unit ...
atomic number
the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. Abbr.: at. ...
atomic orbital
Physics, Chem. See under orbital (def. 2). * * *
atomic physics
Scientific study of the structure of the atom, its energy states, and its interaction with other particles and fields. The modern understanding of the atom is that it consists ...
atomic pile
Physics. reactor (def. 4). [1940-45] * * *
atomic power.
See nuclear power. [1940-45] * * *
atomic radius
▪ physics       half the distance between the nuclei of identical neighbouring atoms. An atom has no rigid spherical boundary, but it may be thought of as a tiny, dense ...
atomic reactor
Physics. reactor (def. 4). * * *
atomic structure
Physics. the structure of an atom, theoretically consisting of a positively charged nucleus surrounded and neutralized by negatively charged electrons revolving in orbits at ...
atomic theory
1. Physics, Chem. any of several theories describing the structure, behavior, and other properties of the atom and its component parts. 2. Philos. atomism (def. 1). [1840-50] * * ...
atomic time
▪ physics       timescale generated by atomic clocks (atomic clock), which furnish time more accurately than was possible with previous astronomical means (measurements ...
atomic unit of length
Physics. See Bohr radius. * * *
atomic volume
Chem. the atomic weight of an element divided by its density. Abbr.: at. vol. * * *
atomic weight
Chem. the average weight of an atom of an element, formerly based on the weight of one hydrogen atom taken as a unit or on 1/16 the weight of an oxygen atom, but after 1961 based ...
atomic age also Atomic Age n. The current era as characterized by the discovery, technological applications, and sociopolitical consequences of nuclear energy. * * *
See atomic. * * *
atomic bomb n. See atom bomb. * * *
atomic clock n. An extremely precise timekeeping device regulated in correspondence with a characteristic invariant frequency of an atomic or molecular system. * * *
atomic energy n. See nuclear energy. * * *
/at'euh mis"i tee/, n. Chem. 1. the number of atoms in a molecule of a gas. 2. valence. [1860-65; ATOMIC + -ITY] * * *
atomic mass n. The mass of an atom, usually expressed in atomic mass units. * * *
atomicmass unit
atomic mass unit n. Abbr. amu A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon 12, which is assigned a mass of 12. Also called dalton. * * *
atomic number n. Symbol Z Abbr. at. no. The number of protons in an atomic nucleus. * * *
atomic pile n. An early type of nuclear reactor whose core consisted of layers of graphite block interspersed with uranium, designed to create a sustained fission reaction. * * *
atomic reactor n. See nuclear reactor. * * *
/euh tom"iks/, n. (used with a sing. v.) Informal. the branch of physics that deals with atoms, esp. atomic energy. [see ATOMIC, -ICS] * * *
atomic theory n. The physical theory of the structure, properties, and behavior of the atom. * * *
atomic veteran n. A former member of the armed forces who was exposed to radioactivity during the testing or use of atom bombs. * * *
atomic weight n. The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic mass units. * * *
—atomist, n. —atomistic, atomistical, adj. —atomistically, adv. /at"euh miz'euhm/, n. 1. Also called atomic theory. Philos. the theory that minute, discrete, finite, and ...
See atomism. * * *
atomistic [at΄əm is′tik] adj. 1. of atoms or atomism 2. made up of a number of unrelated elements atomistically adv. * * * at·om·is·tic (ăt'ə-mĭsʹtĭk) also ...
See atomistic. * * *
See atomize. * * *
—atomization, n. /at"euh muyz'/, v., atomized, atomizing. v.t. 1. to reduce to atoms. 2. to reduce to fine particles or spray. 3. to destroy (a target) by bombing, esp. with an ...
/at"euh muy'zeuhr/, n. an apparatus for reducing liquids to a fine spray, as for medicinal or cosmetic application. [1860-65; ATOMIZE + -ER1] * * *
Atoms for Peace speech
▪ speech by Eisenhower  speech delivered to the United Nations by U.S. Pres. Dwight D. Eisenhower (Eisenhower, Dwight D.) on Dec. 8, 1953 (see primary source document: Atoms ...
atom smasher n. See particle accelerator. * * *
atom trap n. See laser trap. * * *
atomy1 /at"euh mee/, n., pl. atomies. 1. an atom; mote. 2. a small creature; pygmy. [1585-95; sing. use of L atomi, pl. of atomus ATOM] atomy2 /at"euh mee/, n., pl. atomies. a ...
/aht"n/, n. Egyptian Religion. a solar deity declared by Amenhotep IV to be the only god, represented as a solar disk with rays ending in human hands. Also, Aten. * * * or ...
See atone. * * *
—atonalistic, adj. —atonally, adv. /ay tohn"l/, adj. Music. of, pertaining to, or marked by atonality. [1920-25; A-6 + TONAL] * * *
—atonalist, n. /ay tohn"l iz'euhm/, n. Music. 1. atonality. 2. a note, phrase, etc., that seems harsh or discordant. [1925-30; ATONAL + -ISM] * * *
a·ton·a·list (ā-tōʹnə-lĭst) n. One who composes atonal music. * * *

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