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Dickinson, Anna Elizabeth
▪ American lecturer born October 28, 1842, Philadelphia, Pennsylvania, U.S. died October 22, 1932, Goshen, New York  American lecturer on abolitionism, women's rights, and ...
Dickinson, Emily
▪ American poet Introduction in full  Emily Elizabeth Dickinson  born Dec. 10, 1830, Amherst, Mass., U.S. died May 15, 1886, Amherst       American lyric poet who ...
Dickinson, Emily (Elizabeth)
born Dec. 10, 1830, Amherst, Mass., U.S. died May 15, 1886, Amherst U.S. poet. Granddaughter of the cofounder of Amherst College and daughter of a respected lawyer and one-term ...
Dickinson, John
born Nov. 8, 1732, Talbot county, Md. died Feb. 14, 1808, Wilmington, Del., U.S. American statesman. He represented Pennsylvania at the 1765 Stamp Act Congress and drafted the ...
Dickinson, Jonathan
▪ American minister born April 22, 1688, Hatfield, Mass., U.S. died Oct. 7, 1747, Elizabethtown, N.J.       prominent Presbyterian clergyman of the American colonial ...
Dickinson,Emily Elizabeth
Dick·in·son (dĭkʹĭn-sən), Emily Elizabeth. 1830-1886. American poet who was virtually a recluse at her home in Amherst, Massachusetts, where she wrote more than a thousand ...
Dickinson, John. 1732-1808. American Revolutionary politician and pamphleteer who became the leading conservative voice of opposition to Great Britain through his Letters from a ...
/dik"uyt/, n. Mineral. a polymorph of kaolinite. [named after A. B. Dick (d. 1926), English mineralogist + -ITE1] * * *       clay mineral, a form of kaolinite (q.v.). * ...
/dik"seuhn/, n. Leonard Eugene, 1874-1954, U.S. mathematician. * * *
Dickson, Brian
▪ 1999       Canadian jurist who was named to the Supreme Court of Canada in 1973 and served as chief justice from 1984 to 1990; he was a champion of individual rights ...
Dickson, David
▪ American farmer and writer born July 6, 1809, Hancock county, Ga., U.S. died Feb. 18, 1885, Hancock county       American farmer and writer on agriculture. A ...
Dickson, Dorothy Schofield
▪ 1996       U.S.-born British actress and dancer who was a phenomenal success on the London stage in a series of long-running musical comedies in the 1920s and '30s (b. ...
Dickson, Gordon Rupert
▪ 2002       Canadian-born American science-fiction writer (b. Nov. 1, 1923, Edmonton, Alta.—d. Jan. 31, 2001, Minneapolis, Minn.), was one of the world's most ...
Dickson, Leonard Eugene
▪ American mathematician born Jan. 22, 1874, Independence, Iowa, U.S. died Jan. 17, 1954, Harlingen, Texas       American mathematician who made important contributions ...
▪ plant family       the tree fern family, containing about 3 genera and some 30 species, in the division Pteridophyta (the lower vascular plants (plant)). The family ...
Dick test n. A skin test used to determine immunity or susceptibility to scarlet fever.   [After Dick, George Frederick, and Dick, Gladys Henry.] * * *
/dik"tee/, adj., dicktier, dicktiest. dicty. * * *
/dik"ee/, n., pl. dickies. dickey1. * * *
—diclinism, n. /duy"kleuh neuhs, duy kluy"-/, adj. Bot. 1. (of a plant species, variety, etc.) having the stamens and the pistils in separate flowers, either on the same plant ...
See diclinous. * * *
/duy koh"fawl, -fol/, n. a white crystalline solid, C14H9Cl5O, derived from DDT and used to protect crops from mites. [laboratory coinage of unexplained orig.] * * *
/duy"kot/, n. Bot. a dicotyledon. Also, dicotyl /duy kot"l/. [by shortening] * * *
/duy kot'l eed"n, duy'kot l-/, n. Bot. any angiospermous plant of the class (or subclass) Dicotyledoneae, producing seeds with two cotyledons and having an exogenous manner of ...
/duy kot'l eed"n euhs, duy'kot l-/, adj. belonging or pertaining to the Dicotyledoneae; having two cotyledons. [1785-95; DICOTYLEDON + -OUS] * * *
/duy kooh"meuhr in, kyooh"-/, n. Pharm. dicumarol. [1885-90; DI-1 + COUMARIN] * * *
/duy kooh"meuh rawl', -rol', -kyooh"-/ n. Pharm. dicumarol. * * *
—dicrotism /duy"kreuh tiz'euhm/, n. /duy krot"ik/, adj. Physiol. having or pertaining to a double beat of the pulse for each beat of the heart. [1700-10; < Gk díkrot(os) ...
di·cro·tism (dīʹkrə-tĭz'əm) n. A condition in which the pulse is felt as two beats per single heartbeat.   [From Greek dikrotos, double-beating : di-, two; see di-1 + ...
dict abbrev. dictionary * * *
1. dictation. 2. dictator. 3. dictionary. * * *
/dik"teuh/, n. a pl. of dictum. * * *
/dik"teuh fohn'/, Trademark. a brand name for a dictating machine. * * *
—dictatingly, adv. v. /dik"tayt, dik tayt"/; n. /dik"tayt/, v., dictated, dictating, n. v.t. 1. to say or read (something) aloud for another person to transcribe or for a ...
dictating machine
/dik"tay ting/ a machine for recording dictation, as on cassettes or disks, for subsequent transcription. [1935-40] * * *       device for recording, storage (usually ...
—dictational, adj. /dik tay"sheuhn/, n. 1. the act or manner of dictating for reproduction in writing. 2. the act or manner of transcribing words uttered by another. 3. words ...
/dik"tay teuhr, dik tay"teuhr/, n. 1. a person exercising absolute power, esp. a ruler who has absolute, unrestricted control in a government without hereditary succession. 2. ...
—dictatorially, adv. —dictatorialness, n. /dik'teuh tawr"ee euhl, -tohr"-/, adj. 1. of or pertaining to a dictator or dictatorship. 2. appropriate to, or characteristic of, a ...
See dictatorial. * * *
/dik tay"teuhr ship', dik"tay-/, n. 1. a country, government, or the form of government in which absolute power is exercised by a dictator. 2. absolute, imperious, or overbearing ...
dictatorship of the proletariat
dictatorship of the proletariat n. absolute control of economic and political power in a country by a government of the working class (proletariat): regarded in Communist theory ...
—dictional, adj. —dictionally, adv. /dik"sheuhn/, n. 1. style of speaking or writing as dependent upon choice of words: good diction. 2. the accent, inflection, intonation, ...
See diction. * * *
See dictional. * * *
/dik"sheuh ner'ee/, n., pl. dictionaries. 1. a book containing a selection of the words of a language, usually arranged alphabetically, giving information about their meanings, ...
dictionary catalog
a library catalog having all its entries, including authors, titles, subjects, etc., in one general alphabetical sequence. [1875-80, Amer.] * * *
Dictionary of American English on Historical Principles, A
▪ compilation by Craigie and Hulbert       four-volume dictionary designed to define usage of words and phrases in American English as it differed from usage in England ...
Dictionary of Americanisms, A
▪ work by Mathews       two-volume dictionary of words and expressions that originated in the United States or that were first borrowed into the English language in the ...
Dictionary of Modern English Usage
a guide to the rules of good written British English, written by Henry Fowler (1858–1933). It was first published in 1926 and became one of the standard reference books on the ...
Dictionary of National Biography
(abbr the DNB) a book in many volumes containing the life stories of famous British people from the earliest historical period to the present time. It is published by the Oxford ...
Dictionary of the English Language, A
▪ work by Johnson  the famous dictionary of Samuel Johnson (Johnson, Samuel), published in London in 1755; its principles dominated English lexicography for more than a ...
Dictionary of the Irish Language
▪ Irish dictionary       authoritative dictionary of the Irish language that continues, starting with the letter D, the work of Kuno Meyer's Contributions to Irish ...
Dictionnaire alphabétique et analogique de la langue française
▪ French dictionary       (French: “Alphabetical and Analogical Dictionary of the French Language”), scholarly historical dictionary of the French language, which ...
Dictionnaire de la langue française
▪ French dictionary (French: “Dictionary of the French  Language”), also called Dictionnaire Littré, or Littré,         monumental French dictionary compiled ...
/dik"teuh graf', -grahf'/, Trademark. a brand name for a telephonic device with a highly sensitive transmitter obviating the necessity of a mouthpiece: used for listening to ...
/dik"teuhm/, n., pl. dicta /-teuh/, dictums. 1. an authoritative pronouncement; judicial assertion. 2. a saying; maxim. 3. See obiter dictum. [1660-70; < L: something said, a ...
/dik"tee/, adj. dictier, dictiest. Slang. 1. high-class or stylish. 2. snobbish or haughty. Also, dickty. [1925-30; of obscure orig.] * * *
/dik tin"euh/, n. an ancient Cretan goddess of the sea. * * *
/dik"tee euh sohm'/, n. Cell Biol. the set of flattened membranes in a Golgi body, resembling a stack of plates. [1925-30; < Gk díkty(on) net + -O- + -SOME3] * * *
Dictys Cretensis
▪ author       author of a pseudo-chronicle of the Trojan War. Dictys was supposed to have accompanied the Cretan leader Idomeneus from Knossos to the siege of Troy and ...
▪ Irish monk, grammarian, and geographer flourished 825, Ireland       monk, grammarian, and geographer whose work is important to the history of science and is a ...
/duy kooh"meuh rawl", -rol', -kyooh"-/, Pharm. a synthetic coumarin derivative, C19H12O6, used chiefly to prevent blood coagulation and in the treatment of arterial ...
/duy suy'euhn duy am"uyd/, n. Chem. a white, crystalline, rather sparingly water-soluble solid, C2H4N4, produced from cyanamide by polymerization: used in the manufacture of ...
dicyclopentadienyl metal
/duy suy'kloh pen'teuh duy en"l/, Chem. ferrocene (def. 2). [DI-1 + CYCLOPENTADIENE + -YL] * * *
/duy suy'kloh pen'teuh duy en"l uy'euhrn/, n. Chem. ferrocene (def. 1). [DI-1 + CYCLOPENTADIENE + -YL + IRON] * * *
      any member of the order Dicyemida (phylum Rhombozoa) of multicellular wormlike parasites of various marine invertebrates. See mesozoan. * * *
/did/, v. pt. of do1. * * *
Didache [did′ə kē΄] n. 〚Gr didachē (tōn dōdeka apostolōn), the teaching (of the twelve apostles)〛 an anonymous, early 2d-cent. Christian treatise on morality and ...
/duy"dakt/, n. a didactic person; one overinclined to instruct others. [1950-55; prob. back formation from DIDACTIC; cf. AUTODIDACT] * * *
—didactically, adv. —didacticism, n. /duy dak"tik/, adj. 1. intended for instruction; instructive: didactic poetry. 2. inclined to teach or lecture others too much: a boring, ...
See didactic. * * *
See didactically. * * *
didactics [dī dak′tiks] pl.n. PEDAGOGY * * * di·dac·tics (dī-dăkʹtĭks) n. (used with a sing. or pl. verb) Instruction; teaching; pedagogy. * * *
di·dan·o·sine (dĭ-dănʹə-sēn', -sĭn) n. See DDI.   [Shortening and alteration of dideoxyinosine.] * * *
/duy"dap'euhr/, n. a dabchick. [1400-50; late ME dydoppar; shortened form of dive-dapper; see DAP] * * *
▪ literature       the instruction or training of the chorus in ancient Greek drama. The word is from the Greek didaskalía, “teaching or instruction.” The Greek ...
/did"i kuy'/, n. a person of partial Gypsy extraction. [1850-55; < Romany] * * *
diddle1 —diddler, n. /did"l/, v.t., diddled, diddling. Informal. to cheat; swindle; hoax. [1800-10; perh. special use of DIDDLE2] diddle2 —diddler, n. /did"l/, v., diddled, ...
See diddle1. * * *
/did"lee/, n. Bo /boh/, (Elias McDaniel), born 1928, U.S. rock-'n'-roll singer, guitarist, and composer. * * *
Diddley, Bo
▪ 2009 Otha Ellas Bates; Ellas McDaniel        American singer, songwriter, and guitarist born Dec. 30, 1928, McComb, Miss. died June 2, 2008, Archer, Fla. was one of ...
/did"lee/, n., pl. diddlies for 2. Slang. 1. a thing of little or no value; naught: Your excuses aren't worth diddly to me. 2. a flaw; malfunction. [perh. euphemistic shortening ...
diddly squat
☆ diddly squat n. Slang DIDDLY (n. ) diddly-squat adj. * * *
/did"lee skwot'/, n. Slang. doodly-squat. [prob. euphemistic var. of DIDDLYSHIT] * * *
/did"lee shit'/, n. Slang (vulgar). diddly (def. 1). [‡1960-65, Amer.; diddly (perh. DIDDLE2 + -Y2) + SHIT] * * *
▪ American rapper, record producer, and clothing designer original name  Sean John Combs , bynames  Sean “Puffy” Combs,  Puff Daddy , and  P. Diddy  born Nov. 4, ...
Didelot, Charles
▪ French dancer born 1767, Stockholm, Swed. died Nov. 7, 1837, Kiev, Ukraine, Russian Empire [now Ukraine]       Swedish-born French dancer, choreographer, and teacher ...
di·de·ox·y·in·o·sine (dī'dē-ŏk'sē-ĭnʹə-sēn', -sĭn, -īʹnə-) n. DDI. * * *
/dee"deuh roh'/; Fr. /deedeu rddoh"/, n. Denis /deuh nee"/, 1713-84, French philosopher, critic, and encyclopedist. * * *
Diderot, Denis
born Oct. 5, 1713, Langres, France died July 31, 1784, Paris French man of letters and philosopher. Educated by Jesuits, Diderot later received degrees from the University of ...
Di·de·rot (dēʹdə-rō', dē-drōʹ), Denis. 1713-1784. French philosopher and writer whose supreme accomplishment was his work on the Encyclopédie (1751-1772), which ...
/dij'euh ree dooh", dij"euh ree dooh'/, n., pl. didgeridoos. a musical instrument of Australian Aborigines made from a long wooden tube that is blown into to create a low ...
▪ 2002 Waldir Pereira        Brazilian association football (soccer) player (b. Oct. 8, 1928/29, Campos, Braz.—d. May 12, 2001, Rio de Janeiro, Braz.), was a key ...
Didion, Joan
born Dec. 5, 1934, Sacramento, Calif., U.S. U.S. novelist and essayist. Her writing explores disorder and personal and social unrest. Her first novel was published in 1963; ...
Didius Severus Julianus, Marcus
▪ Roman emperor born 133 died June 2, 193       wealthy Roman senator who became emperor (March 28–June 1, 193) by being the highest bidder in an auction for the ...
didj·er·i·doo or didg·er·i·doo (dĭj'ə-rē-do͞oʹ, dĭjʹə-rē-do͞o') n. pl. didj·er·i·doos A musical instrument of the Aboriginal peoples of Australia, consisting ...
▪ musical instrument also spelled  didgeridoo  or  didjeridoo  also called  dronepipe        wind instrument in the form of a straight wooden trumpet. The ...
/did"nt/ contraction of did not. Usage. See contraction. * * *
/duy"doh/, n., pl. didos, didoes. Usually, didos, didoes. Informal. 1. a mischievous trick; prank; antic. 2. a bauble or trifle. [1800-10; orig. uncert.] * * * In Greek legend, ...
/duy"doh/, n. 1. Phoenician, Elissa. Class. Myth. a queen of Carthage who killed herself when abandoned by Aeneas. 2. a female given name. * * * In Greek legend, the founder of ...
Dido and Aeneas
the first English opera (1689). It was composed by Henry Purcell with words by the Irish poet Nahum Tate. The story is based on The Aeneid by the Roman poet Virgil. * * *
Didot family
Family of French printers, publishers, and typefounders. The family had a profound influence on the history of typography. François Didot (1689–1759) went into business as a ...
Didot point system
/dee doh"/, Print. a Continental system of measurement for type, based on a unit of 0.0148 in. (0.3759 mm). [named after François Ambrose Didot (1730-1804), French printer who ...
/duy"dram'/, n. a silver coin of ancient Greece equal to two drachmas. Also, didrachma /duy drak"meuh/. [1540-50; < LL didrachmon < Gk dídrachmon worth two drachms. See DI-1, ...
/did"rik seuhn/, n. Mildred. See Zaharias, Mildred Didrikson. * * * (as used in expressions) Zaharias Babe Didrikson Mildred Ella Didrikson Babe Didrikson * * *
Didrikson,Mildred Ella
Did·rik·son (dĭdʹrĭk-sən), Mildred Ella. See Zaharias, Mildred Ella Didrikson. * * *
/didst/, v. Archaic. 2nd pers. sing. pt. of do1. * * *
/duy"dee/, n., pl. didies. Baby Talk. diaper (def. 1). Also, didie. [1900-05; by alter.] * * *
Ancient sanctuary, south of Miletus in modern Turkey. Its temple, the seat of an oracle of Apollo, was plundered by the Persians с 494 BC and resanctified after Alexander the ...
▪ plant order       order of dicotyledonous flowering plants comprising the family Didymelaceae, with one genus (Didymeles) and two species, both of which are trees of ...
/duy dim"ee euhm, di-/, n. Chem. a mixture of neodymium and praseodymium, formerly thought to be an element. Symbol: Di [ < NL < Gk dídym(os) twin (see DIDYMOUS) + -IUM; so ...
▪ graptolite genus  genus of graptolites (an extinct group of colonial animals related to primitive chordates) found as fossils in Early and Middle Ordovician marine rocks ...
/did"euh meuhs/, adj. Bot. occurring in pairs; paired; twin. [1785-95; < Gk dídymos twin, double, (akin to dís twice, double); see -OUS] * * *
Didymus [did′ə məs] n. see THOMAS1 (the Apostle) * * *
Didymus Chalkenteros
▪ Greek scholar Chalkenteros also spelled  Chalcenterus   flourished c. 80–10 BC, Alexandria       Greek scholar and grammarian, one of the chief links between ...
Didymus The Blind
▪ Christian theologian born c. 313, , Alexandria, Egypt died c. 398, , Alexandria       Eastern church theologian who headed the influential catechetical school of ...
—didynamy, n. /duy din"euh meuhs/, adj. (of a flower) having four stamens in two pairs of different length. [1785-95; < NL Didynam(ia) name of the class (equiv. to di- DI-1 + ...
die1 /duy/, v.i., died, dying. 1. to cease to live; undergo the complete and permanent cessation of all vital functions; become dead. 2. (of something inanimate) to cease to ...
die cast
to shape or form by die casting. [1905-10] * * *
die casting
—die-casting, adj. Metall. 1. a process in which molten metal is forced into metallic molds under hydraulic pressure to shape it, form objects, etc. 2. an article made by this ...
/duy"kast', -kahst'/, adj. formed by die casting. [1905-10] * * *
▪ industrial process       forming metal objects by injecting molten metal under pressure into dies, or molds. An early and important use of the technique was in the ...
—die-hardism, n. /duy"hahrd'/, n. 1. a person who vigorously maintains or defends a seemingly hopeless position, outdated attitude, lost cause, or the like. adj. 2. resisting ...
See die-hard. * * *
/duy"awf', -of'/, n. a sudden, natural perishing of large numbers of a species, population, or community. [1935-40; n. use of v. phrase die off] * * *
dieb. alt.
(in prescriptions) every other day. [ < L diebus alternis] * * *
dieb. secund.
(in prescriptions) every second day. [ < L diebus secundis] * * *
dieb. tert.
(in prescriptions) every third day. [ < L diebus tertius] * * *
/duy"bak'/, n. Plant Pathol. a condition in a plant in which the branches or shoots die from the tip inward, caused by any of several bacteria, fungi, or viruses or by certain ...
Diebenkorn, Richard
born April 22, 1922, Portland, Ore., U.S. died March 30, 1993, Berkeley, Calif. U.S. painter. After studying at Stanford University, he taught at California Institute of the ...
Diebitsch, Johann, Graf
▪ Russian military officer (Count),Russian  Ivan Ivanovich Dibich-zabalkansky   born May 13, 1785, Grossleipe, Silesia, Prussia died June 10, 1831, Kleczewo, near Pułtusk, ...
Diebold, John
▪ 2006       American business consultant (b. June 8, 1926, Weehawken, N.J.—d. Dec. 26, 2005, Bedford Hills, N.Y.), was an early promoter of the use of computer ...
—dieciously, adv. /duy ee"sheuhs/, adj. Biol. dioecious. * * *
/dee"feuhn bay'keuhr/, n. John George, 1895-1979, prime minister of Canada 1957-63. * * *
Diefenbaker, John G(eorge)
born Sept. 18, 1895, Grey county, Ont., Can. died Aug. 16, 1979, Ottawa Prime minister of Canada (1957–63). After serving in World War I, he practiced law in Saskatchewan. He ...
Diefenbaker, John G.
▪ prime minister of Canada in full  John George Diefenbaker  born Sept. 18, 1895, Neustadt, Ont., Can. died Aug. 16, 1979, Ottawa  leader of the Progressive Conservative ...
Diefenbaker,John George
Die·fen·ba·ker (dēʹfən-bā'kər), John George. 1895-1979. Canadian politician who served as prime minister (1957-1963). * * *
/dee'feuhn bak"ee euh, -bah"kee euh/, n. any of various plants belonging to the genus Dieffenbachia, of the arum family, native to tropical America, often cultivated as ...
(as used in expressions) Almagro Diego de Maradona Diego Armando Rivera Diego San Diego San Diego Zoo Siloé Diego de Velázquez Diego Rodríguez de Silva * * *
Diego blood group system
      classification of human blood according to the properties conferred by the presence of an antigen designated Di. There are 21 known Diego antigens; however, the ...
Diego Garcia
Diego Garcia [dē ā′gō gär sē′ə] chief island of the Chagos Archipelago, British Indian Ocean Territory: 17 sq mi (44 sq km) * * * ▪ island, Indian Ocean  coral ...
Diego Garcia: A Strategic Base
▪ 2004  When the U.S. and its allies launched their attack on Iraq in 2003, Diego Garcia—home to U.S. long-range bombers, patrol planes, and cargo ships as well as refueling ...
Diego, Gerardo
▪ Spanish poet and musicologist in full  Gerardo Diego Cendoya  born Oct. 3, 1896, Santander, Spain died July 8, 1987, Madrid       Spanish musicologist and prolific, ...
/dyay"goh swahr"es/, n. a seaport on N Madagascar. 46,000. Also called Antsirane. * * *
▪ people also called  San Diegueño         a group of Yuman-speaking North American Indians who originally inhabited large areas extending on both sides of what is ...
/duy"euhl, dee"-/, adj. Biol. of or pertaining to a 24-hour period, esp. a regular daily cycle, as of the physiology or behavior of an organism. [1930-35; appar. < L di(es) day + ...
▪ paleontology  genus of extinct brachiopods, or lamp shells, that occur as fossils in rocks deposited in marine environments of Carboniferous to Permian age (between 359 ...
/deel"drin/, n. Chem. a light tan, crystalline, water-insoluble, poisonous solid, C12H8OCl6, used as an insecticide: manufacture and use have been discontinued in the ...
—dielectrically, adv. /duy'i lek"trik/, Elect. n. 1. a nonconducting substance; insulator. 2. a substance in which an electric field can be maintained with a minimum loss of ...
dielectric constant
Elect. permittivity. [1870-75] * * * ▪ physics       property of an electrical insulating material (a dielectric) equal to the ratio of the capacitance of a capacitor ...
Dielectric constants of some materials
▪ Table Dielectric constants of some materials (at room temperature) material dielectric constant vacuum 1.0 air 1.0006 oil 2.2 polyethylene 2.26 beeswax 2.8 fused ...
dielectric heating
Elect. the heating of a nonconducting substance caused by dielectric loss when the material is placed in a variable electric field. [1940-45] * * * ▪ physics also called ...
dielectric loss
Elect. the loss of power in a dielectric caused by the loss of energy in the form of heat generated by an electric field. * * *
dielectric strength
Elect. the maximum voltage that can be applied to a given material without causing it to break down, usually expressed in volts or kilovolts per unit of thickness. Cf. breakdown ...
See dielectric. * * *
dielectric constant n. See permittivity. * * *
dielectric heating n. The heating of electrically nonconducting materials by a rapidly varying electromagnetic field. * * *
/deelz/; Ger. /deels/, n. Otto /ot"oh/; Ger. /awt"oh/, 1876-1954, German chemist: Nobel prize 1950. * * *
Diels, Otto Paul Hermann
▪ German chemist born Jan. 23, 1876, Hamburg, Ger. died March 7, 1954, Kiel, W.Ger.       German organic chemist who with Kurt Alder was awarded the Nobel Prize for ...
Diels,Otto Paul Hermann
Diels (dēlz, dēls), Otto Paul Hermann. 1876-1954. German chemist. He shared a 1950 Nobel Prize for discoveries concerning the structure of organic matter. * * *
Diels-Alder reaction
/deelz"ahl"deuhr/, Chem. the reaction in which a conjugated diene combines with a double or triple bond of a given compound to form a ring of six carbon atoms. [named after O. ...
Diem,Ngo Dinh
Di·em (dē-ĕmʹ, dyĕm), Ngo Dinh. 1901-1963. Vietnamese political leader who became president of South Vietnam in 1954. He was assassinated in a military coup d'état. * * *
Diemen, Anthony van
born 1593, Culemborg, Neth. died April 19, 1645, Batavia, Dutch East Indies Dutch colonial administrator who consolidated the Dutch empire in the Far East. He joined the Dutch ...
Diémer, Louis-Joseph
▪ French pianist born Feb. 14, 1843, Paris died Dec. 21, 1919, Paris       French pianist and teacher who was one of the first advocates of early keyboard music and ...
Diemer, Walter E.
▪ 1999       American businessman who was working as an accountant for the Fleer Chewing Gum Co. when in 1928 he accidentally invented bubble gum while experimenting ...
Dien Bien Phu
/dyen" byen' fooh"/ a town in NW Vietnam: site of defeat of French forces by Vietminh 1954, bringing to an end the French rule of Indochina. * * *
Dien Bien Phu, Battle of
(1953–54) Decisive engagement in the first of the Indochina wars (1946–54) that marked the end of French involvement in Southeast Asia. The French fought the Viet Minh (Lien ...
DienBien Phu
Dien Bien Phu (dyĕn' byĕn' fo͞oʹ) A town of northwest Vietnam near the Laos border. The French military base here fell to Vietminh troops on May 7, 1954, after a 56-day ...
See diencephalon. * * *
—diencephalic /duy'en seuh fal"ik/, adj. /duy'en sef"euh lon'/, n., pl. diencephalons, diencephala /-leuh/. Anat. the posterior section of the forebrain. [1880-85; < NL; see ...
/duy"een, duy een"/, n. Chem. any compound, as 1,3-butadiene, CH2=CH-CH=CH2, that contains two double bonds. Also called diolefin. [1915-20; DI-1 + -ENE] * * *
Dienes, Valéria
▪ Hungarian dancer, teacher, and choreographer Hungarian form  Dienes Valéria , née  Valéria Geiger  born May 25, 1879, Szekszárd, Hung. died June 8, 1978, ...
Dientzenhofer, Christoph
▪ German architect born July 7, 1655, Rosenheim, Bavaria [now in Germany] died June 20, 1722, Prague, Bohemia, Austrian Habsburg [now in Czech Republic]  German architect who ...
Dientzenhofer, Kilian Ignaz
▪ German architect born Sept. 1, 1689, Prague, Bohemia, Austrian Habsburg domain [now in Czech Republic] died Dec. 18, 1751, Prague  German architect who was one of the ...
/dee ep"/; Fr. /dyep/, n. a seaport in N France, on the English Channel: raided by an Allied expeditionary force August 1942. 26,111. * * * Town (pop., 1999: 34,598) and ...
—dieretic /duy'euh ret"ik/, adj. /duy er"euh sis/, n., pl. diereses /-seez'/. 1. the separation of two adjacent vowels, dividing one syllable into two. 2. a sign (¨) placed ...
/duyz/, n. Martin, 1901-72, U.S. politician. * * *
Dies Committee
U.S. Hist. an early, informal name for the House Un-American Activities Committee. [named after Martin DIES, its first chairman] * * *
Dies Irae
/dee"ays ear"ay/ a Latin hymn on the Day of Judgment, commonly sung in a Requiem Mass. * * * ▪ hymn       (Latin: “Day of Wrath”), the opening words of a Latin hymn ...
dies non
/duy"eez non", dee"ays nohn"/, Law. a day on which no courts can be held. [1600-10; short for L dies non juridicus a day not juridical (for legal business)] * * *
Dies, Martin, Jr.
born Nov. 5, 1901, Colorado, Texas, U.S. died Nov. 14, 1972, Lufkin, Texas U.S. politician. He received a law degree from National University in Washington, D.C. in 1920. After ...
/dee"zeuhl, -seuhl/, adj. 1. noting a machine or vehicle powered by a diesel engine: diesel locomotive. 2. of or pertaining to a diesel engine: diesel fuel. n. 3. See diesel ...
/dee"zeuhl, -seuhl/, n. Rudolf /rooh"dolf, -dawlf/; Ger. /rddooh"dawlf/, 1858-1913, German automotive engineer. * * *
diesel cycle
Mach. a theoretical heat cycle for an engine in which combustion occurs at a constant pressure and cooling at a constant volume. * * *
diesel engine
a compression-ignition engine in which a spray of fuel, introduced into air compressed to a temperature of approximately 1000° F (538° C), ignites at a virtually constant ...
diesel fuel
a combustible petroleum distillate used as fuel for diesel engines. Also called diesel oil. * * *
Diesel, Rudolf
▪ French-German engineer born March 18, 1858, Paris, France died September 29, 1913, at sea in the English Channel  German thermal engineer who invented the ...
Diesel, Rudolf Christian Karl
born March 18, 1858, Paris, France died Sept. 29, 1913, at sea in the English Channel German thermal engineer. In the 1890s he invented the internal-combustion engine that ...
Die·sel (dēʹzəl), Rudolf. 1858-1913. German engineer who devised and patented (1892) an internal-combustion engine. * * *
/dee"zeuhl i lek"trik, -seuhl-/, adj. having an electric motor powered directly by an electric generator or by batteries charged by the generator, with the generator being driven ...
diesel engine cycles of a four-stroke diesel engine A. intake stroke B. compression stroke C. power stroke D. exhaust stroke Precision Graphics n. An internal-combustion engine ...
/dee"zeuh ling, -seuh-/, n. Auto. after-run. [1950-55; DIESEL + -ING1] * * *
—dieselization, n. /dee"zeuh luyz', -seuh-/, v., dieselized, dieselizing. v.t. 1. to equip with diesel machinery. v.i. 2. to become equipped with diesel machinery or vehicles, ...
/duy"sing'keuhr/, n. an engraver of dies for stamping or embossing. [1805-15; DIE2 + SINKER] * * *
See diesinker. * * * ▪ metallurgy  process of machining a cavity in a steel block to be used for molding plastics, or for hot and cold forging, die-casting, and ...
Di·es I·rae (dē'ās îrʹā') n. A medieval Latin hymn describing Judgment Day, used in some masses for the dead.   [Medieval Latin Diēs īrae, day of wrath (the first ...
/duy"euh sis/, n., pl. dieses /-seez'/. Print. See double dagger. [1350-1400; orig., any of several musical intervals smaller than a tone (for which a double dagger was used as a ...
/duy"es'teuhr/, n. Chem. an organic compound that contains two ester groups. [1930-35; DI-1 + ESTER] * * *
/duy"stok'/, n. a frame for holding a number of standard threaded dies for cutting screw threads. [1860-65; DIE2 + STOCK] * * *
See diestrus. * * *
—diestrous, adj. /duy es"treuhs/, n. (in female mammals) an interval of sexual inactivity between periods of estrus. Also, Brit. dioestrus. [1940-45; DI-3 + ESTRUS] * * *
diet1 —dieter, n. /duy"it/, n., v., dieted, dieting, adj. n. 1. food and drink considered in terms of its qualities, composition, and its effects on health: Milk is a wholesome ...
diet kitchen
a kitchen, as in a hospital, where special food is prepared for those requiring it. [1865-70, Amer.] * * *
Diet of Worms
▪ Germany [1521]       meeting of the Diet (assembly) of the Holy Roman Empire held at Worms, Germany, in 1521 that was made famous by Martin Luther (Luther, Martin)'s ...
diet pill
a tablet or capsule containing chemical substances that aid in reducing or controlling body weight, usually by suppressing the appetite. [1965-70] * * *
See dietary. * * *
—dietarily, adv. /duy"i ter'ee/, adj., n., pl. dietaries. adj. 1. of or pertaining to diet: a dietary cure. n. 2. a regulated allowance of food. 3. Obs. a system or course of ...
dietary fiber
fiber (def. 9). [1975-80] * * *
dietary law
Judaism. law dealing with foods permitted to be eaten, food preparation and combinations, and the utensils and dishes coming into contact with food. Cf. kashruth. [1925-30] * * ...
dietary law n. Judaism The body of regulations prescribing the kinds and combinations of food that may be eaten. * * *
See diet1. * * *
—dietetically, adv. /duy'i tet"ik/, adj. Also, dietetical. 1. pertaining to diet or to regulation of the use of food. 2. prepared or suitable for special diets, esp. those ...
See dietetic. * * *
dietetics [dī΄ə tetiks] n. the study of the kinds and quantities of food needed for health * * * di·e·tet·ics (dī'ĭ-tĕtʹĭks) n. (used with a sing. verb) The study ...
diethyl carbinol
diethyl carbinol [dī eth′əl] n. a colorless, liquid isomer of amyl alcohol, (CH3CH2) 2CHOH, used in drugs and as a solvent * * *
diethyl ether
/duy eth"euhl/, Chem. ether (def. 1). [1925-30; DI-1 + ETHYL] * * *
diethyl oxide
Chem. ether (def. 1). * * *
/duy eth'euhl as"i tal'/, n. Chem. acetal (def. 1). [DI-1 + ETHYL + ACETAL] * * *
/duy eth'euhl euh mee'noh eth"euh nawl', -nol', -am'euh noh-/, n. Chem. a colorless, hygroscopic, water-soluble liquid, C6H15NO, used for the synthesis of local anesthetics, in ...
diethylbarbituric acid
diethylbarbituric acid [dī eth΄əl bär΄bə tyoor′ik, dī eth΄əl bär΄bətoor′ik] n. BARBITAL * * *
/duy eth'euhl kahr bam"euh zeen'/, n. Pharm. an anthelmintic, C10H21N3O, used in the treatment of various filarial worm infestations, esp. those of the genera Wuchereria, Loa, ...
di·eth·yl·car·bam·a·zine citrate (dī-ĕth'əl-kär-bămʹə-zēn') n. An anthelmintic agent, C16H29O8N3, used especially in the treatment of ascariasis and ...
diethylene glycol
/duy eth"euh leen'/, Chem. a syrupy colorless liquid, C4H10O3, used as a solvent for cellulose nitrate and as a fabric softener. Also called diglycol. [DI-1 + ETHYLENE] * * *
di·eth·yl ether (dī-ĕthʹəl) n. See ether. * * *
/duy eth'euhl proh"pee euhn/, n. Pharm. a sympathomimetic substance, C13H19NO·HCl, used as an appetite suppressor and a short-term adjunct in the management of certain kinds of ...
/duy eth'euhl stil bes"trawl, -trol/, n. Pharm. a nonsteroidal synthetic estrogen, C18H20O2, used in medicine chiefly in the treatment of menopausal symptoms and in animal feeds ...
/duy eth'euhl tol"yooh euh muyd', -mid/, n. Chem. a liquid, C12H17NO, used as an insect repellent and resin solvent. Cf. Deet. [DI-1 + ETHYL + TOLU + AMIDE] * * *
/duy eth'euhl trip"teuh meen', -min/, n. Pharm. a synthetic derivative of tryptamine with hallucinogenic and psychotogenic effects. Abbr.: DET [DI-1 + ETHYL + TRYPTAMINE] * * *
Regulating food intake to improve physical condition, especially to lose weight. Examples include diets low in fat for weight loss, low in saturated fat and cholesterol to ...
/duy'i tish"euhn/, n. a person who is an expert in nutrition or dietetics. Also, dietician. [1840-50; DIET1 + -itian; see -ICIAN] * * *
diet pyramid n. See food pyramid. * * *
/dee"trik, -trikh/, n. Marlene /mahr lay"neuh/, 1904-92, U.S. actress and singer, born in Germany. * * * (as used in expressions) Bonhoeffer Dietrich Buxtehude Dietrich Dietrich ...
Dietrich von Bern
/dee"trddikh feuhn berddn"/ Theodoric of Verona: the name of the eastern Gothic emperor Theodoric as it appears in German legends. * * * ▪ German mythology       heroic ...
Dietrich, Josef
▪ German military officer byname  Sepp  born May 28, 1892, Hawangen, Germany died April 21, 1966, Ludwigsburg, West Germany       German SS officer who commanded ...
Dietrich, Marlene
orig. Maria Magdalene Dietrich born Dec. 27, 1901, Berlin, Ger. died May 6, 1992, Paris, France German-U.S. film actress and singer. After joining Max Reinhardt's theatre ...
Die·trich (dēʹtrĭk, -trĭKH), Marlene. 1901-1992. German-born American actress and singer whose first internationally famous role was the sultry-voiced temptress in The Blue ...
Dietz, Howard
born Sept. 9, 1896, New York, N.Y., U.S. died July 30, 1983, New York City U.S. songwriter. He studied at Columbia University and later joined an advertising agency, where he ...
Dietz, Robert S.
▪ American geophysicist in full  Robert Sinclair Dietz   born Sept. 14, 1914, Westfield, N.J., U.S. died May 19, 1995, Tempe, Ariz.       American geophysicist and ...
Dietz, Robert Sinclair
▪ 1996       U.S. geophysicist and oceanographer (b. Sept. 14, 1914, Westfield, N.J.—d. May 19, 1995, Tempe, Ariz.), plumbed the ocean depths and set forth (1961) a ...
Dieu et mon droit
/dyue" ay mawonn drddwann"/, French. God and my right: motto on the royal arms of England. * * *
Dieu vous garde
/dyue" vooh gannrddd"/, French. God keep you. * * *
Dieudonné, Jean
▪ French mathematician in full  Jean-alexandre-eugène Dieudonné   born July 1, 1906, Lille, France died Nov. 29, 1992, Paris       French mathematician and educator ...
Dieulafoy, Marcel-Auguste
▪ French archaeologist born Aug. 3, 1844, Toulouse, France died Feb. 25, 1920, Paris       French archaeologist and civil engineer who excavated the palaces of the ...
In the pre-Christian Baltic religion, the sky god. Along with the goddess Laima, he determined the course of the world and human destiny. He was pictured as a Baltic king who ...
Diez, Friedrich Christian
born March 15, 1794, Giessen, Hesse-Darmstadt died May 29, 1876, Bonn, Ger. German linguist, regarded as the founder of Romance philology. He began his career as a scholar of ...
/dif/, n. Informal. difference: What's the dif where you buy it, as long as you get it? [1910-15; by shortening] * * *
var. of dis-1 before f: differ. * * *
1. difference. 2. different. * * *
diff or dif [dif] n. [Slang] short for DIFFERENCE [what's the diff?] * * * diff (dĭf) n. Informal Difference: “[His] flaw... starts with a fleshy calculation, an instinct to ...
1. difference. 2. different. * * *
/dif'ee oh mawr"fiz euhm/, n. Math. a differentiable homeomorphism. [by contr.] * * *
/dif"euhr/, v.i. 1. to be unlike, dissimilar, or distinct in nature or qualities (often fol. by from): The two writers differ greatly in their perceptions of the world. Each ...
/dif"euhr euhns, dif"reuhns/, n., v., differenced, differencing. n. 1. the state or relation of being different; dissimilarity: There is a great difference between the two. 2. an ...
Difference Engine
▪ calculating machine       an early calculating machine, verging on being the first computer, designed and partially built during the 1820s and '30s by Charles Babbage ...
difference equation
Equation involving differences between successive values of a function of a discrete variable (i.e., one defined for a sequence of values that differ by the same amount, usually ...
difference ring
Math. See quotient ring. * * *
—differently, adv. —differentness, n. /dif"euhr euhnt, dif"reuhnt/, adj. 1. not alike in character or quality; differing; dissimilar: The two are different. 2. not identical; ...
/dif'euh ren"shee euh, -sheuh/, n., pl. differentiae /-shee ee'/. 1. the character or attribute by which one species is distinguished from all others of the same genus. 2. the ...
See differentiable. * * *
—differentiability, n. /dif'euh ren"shee euh beuhl, -sheuh beuhl/, adj. capable of being differentiated. [1860-65; DIFFERENTI(ATE) + -ABLE] * * *
differentiable manifold
Math. a manifold having the property that any two overlapping open sets are homeomorphic to locally Euclidean spaces whose coordinates are related by differentiable functions, a ...
dif·fer·en·ti·ae (dĭf'ə-rĕnʹshē-ē') n. Plural of differentia. * * *
—differentially, adv. /dif'euh ren"sheuhl/, adj. 1. of or pertaining to difference or diversity. 2. constituting a difference; distinguishing; distinctive: a differential ...
differential analyzer
an analog computer designed for solving certain differential equations. [1930-35] * * * ▪ device       computing device for solving differential equations. Its ...
differential association
a theory that criminal and deviant behavior is learned through close and frequent association with criminal or deviant behavior patterns, norms, and values. * * *
differential calculus
the branch of mathematics that deals with differentials and derivatives. [1700-05] * * * Branch of mathematical analysis, devised by Isaac Newton and G.W. Leibniz, and concerned ...

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