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See National Public Radio. Also, N.P.R. * * *
To shake, shatter. intifada, from Arabic intifāḍa, shudder, awakening, uprising, from intafaḍa, to be shaken, shudder, wake up, derived stem of nafaḍa, to shake. * * *
nonproliferation treaty. * * *
To sift. apron, map, mop, napery, napkin, nappe, from Latin mappa, originally napkin, cloth, said by the Roman author Quintilian to be of Punic origin, perhaps from Phoenician ...
To pierce. Maccabee, from Hebrew maqqebet (< *manqabt-), hammer, from nāqab, to pierce. * * *
To bore, pierce. nacre, from Arabic naqqāra, small drum, from naqara, to bore, pierce. * * *
NR abbrev. not rated: said of films that have not received a rating * * *
near. * * *
1. U.S. Govt. National Recovery Administration: the former federal agency (1933-36) charged with administering the provisions of the National Industrial Recovery Act. 2. National ...
National Railroad Adjustment Board. * * *
1. National Research Council. 2. See Nuclear Regulatory Commission. * * *
/en"rem", non"rem"/, n. non-REM; non-rapid eye movement. * * *
NREM sleep
/en"rem'/, adj. See slow-wave sleep. Cf. REM sleep. [1960-65; n(on-)r(apid) e(ye) m(ovement)] * * *
Naval Reserve Officer Training Corps. Also N.R.O.T.C. * * *
National Resources Planning Board. * * *
NRSV abbrev. New Revised Standard Version (of the Bible) * * *
National Retired Teachers Association. * * *
1. not sufficient (funds). 2. Nova Scotia, Canada (approved for postal use). 3. nuclear ship. * * *
Meteorol. nimbostratus. * * *
nanosecond; nanoseconds. Also, nsec. * * *
➡ National Savings. * * *
1. National Security Agency. 2. National Shipping Authority. 3. National Standards Association. 4. National Student Association. Also, N.S.A. * * *
nonsteroidal anti-inflammatory drug. * * *
or nonsteroidal anti-inflammatory drugs Drugs that reduce inflammation and are effective against pain (see analgesic) and fever. Most are available without prescription and are ...
▪ Malawi formerly  Port Herald,         town, southern Malawi (Malaŵi). It lies along the west bank of the Shire River and is situated north of the Ndindi Marsh. The ...
1. National Safety Council. 2. See National Security Council. * * *
NSE abbr. National Stock Exchange. * * *
nsec abbr. nanosecond. * * *
▪ people also spelled  Senga,         a Bantu-speaking people inhabiting the Luangwa River valley area of southeastern Zambia. It is difficult to differentiate the ...
1. See National Science Foundation. 2. not sufficient funds. Also, N.S.F. * * *
NSPCA abbr. National Society for the Prevention of Cruelty to Animals. * * *
(in full the National Society for the Prevention of Cruelty to Children) a British charity that has worked to prevent child abuse of all kinds since 1884. It operates a 24-hour ...
nonspecific urethritis. See nongonococcal urethritis. * * *
▪ Nigeria       university town, Enugu state, southern Nigeria. It lies in the Udi Hills at an elevation of 1,300 feet (396 m). Nsukka is an agricultural-trade centre ...
NSW abbrev. New South Wales * * *
1. New Testament. 2. Northwest Territories, Canada (approved for postal use). * * *
Symbol, Chem. niton. * * *
Physics. nit; nits. * * *
nt wt
nt wt abbrev. net weight * * *
nt. wt.
net weight. * * *
nt.wt. abbr. net weight. * * *
NTA abbrev. 〚n(itrilo)t(ri)a(cetic) acid〛 a white crystalline powder, N(CH2COOH) 3, formerly used in detergents for its biodegradable qualities, but now considered a possible ...
/enth/, adj. 1. being the last in a series of infinitely decreasing or increasing values, amounts, etc. 2. (of an item in a series of occurrences, planned events, things used, ...
nth root n. See root1. * * *
National Telecommunications and Information Administration. * * *
To give. 1. a. Matthew, from Hebrew mattayyāh, from *mattan-yāh, gift of Yahweh, from mattan, bound form of mattān (< *mantan), gift (yāh, Yahweh; see hwy); b. i Nathan, from ...
NTP abbrev. normal temperature and air pressure: former term for STP * * * NTP abbr. normal temperature and pressure. * * *
See National Transportation Safety Board. * * *
Central Semitic, to stretch out, extend, incline. mat1, from Late Latin matta, possibly from Phoenician (Punic) *maṭṭē (< *manṭay- or *manṭiy-), akin to Hebrew ...
Arabic root, to arrange. Nizam, from Arabic niẓām, order, arrangement, from naẓama, to arrange. * * *
To see, watch, observe, guard. 1. a. Nebuchadnezzar, from Hebrew nəbûkadneʾṣṣar (also nəbûkadreʾṣṣar, whence English byform Nebuchadrezzar), alteration of Akkadian ...
nu1 /nooh, nyooh/, n. 1. the 13th letter of the Greek alphabet (N, v). 2. the consonant sound represented by this letter. [1885-90; < Gk nû < Sem; cf. NUN2] nu2 /nooh/, ...
/nooh/, n. U /ooh/, (Thauin Nu), born 1907, Burmese political leader: prime minister 1948-56, 1957-58, 1960-62. * * *
Nü Kua
▪ Chinese mythology Pinyin  Nü Gua,         in Chinese mythology, the patroness of matchmakers; as wife or sister of the legendary emperor Fu Hsi, she helped ...
nu metal
n [U] a type of heavy metal music which is influenced by hip hop and has aggressive songs and a heavy drum beat. Well known nu metal bands include Deftones, Korn and Slipknot. * ...
Nu, U
orig. Thakin Nu born May 25, 1907, Wakema, Burma died Feb. 14, 1995, Yangôn, Myanmar Burmese independence leader and prime minister of Burma (Myanmar; 1948–58, ...
Now. Related to newo-. 1. now, from Old English nū, now. 2. quidnunc, from Latin nunc, now (< *nun-ce; -ce, a particle meaning “this,” “here” see ko-).   [Pokorny nu- ...
/nyuu"kwah"/, n. a Chinese goddess who repaired and restored order to heaven and earth when they were damaged, and who created the human race. * * *
/nooh"val'yooh, nyooh"-/, n. Optics. See Abbe number. * * *
—nuanced, adj. /nooh"ahns, nyooh"-, nooh ahns", nyooh-/; Fr. /nyuu ahonns"/, n., pl. nuances /-ahn siz, -ahn"siz/; Fr. /-ahonns"/. 1. a subtle difference or distinction in ...
nuanced [no͞o′änst΄] adj. treated or done so as to show or display small, delicate, or subtle variations, gradations, etc., as in meaning * * * See nuance. * * *
/nub/, n. 1. the point, gist, or heart of something. 2. a knob or protuberance. 3. a lump or small piece: a nub of coal; a nub of pencil. 4. a small mass of fibers produced on a ...
Nu·ba (no͞oʹbə, nyo͞oʹ-) n. pl. Nuba 1. A member of any of several peoples inhabiting the hills of south-central Sudan. 2. See Nubian. * * * ▪ ...
Nūbār Pasha
▪ prime minister of Egypt also called  Nūbār Pasha Nūbārian   born Jan. 4, 1825, Smyrna, Ottoman Empire [now İzmir, Tur.] died Jan. 14, 1899, Paris, France  Egyptian ...
/nub"in/, n. 1. a small lump or stunted piece; stub. 2. a small or imperfect ear of corn. 3. an undeveloped fruit. [1685-95, Amer.; perh. NUB + -in, var. of -ING1] * * *
/nub"euhl/, n. 1. a small lump or piece. 2. a small knob or protuberance. [1810-20; NUB + -LE (dim. suffix)] * * *
/nub"lee/, adj., nubblier, nubbliest. 1. full of small protuberances. 2. in the form of small lumps. Also, knubbly. [1820-30; NUBBLE + -Y1] * * *
/nub"ee/, adj. nubbier, nubbiest. having nubs; knobby or lumpy. Also, knubby, nubbed, knubbed. [1875-80; NUB + -Y1] * * *
/nooh"bee euh, nyooh"-/, n. a light, knitted woolen head scarf for women. [1855-60; < L nub(es) a cloud + -IA] * * * Ancient region of the Nile River valley, northeastern ...
/nooh"bee euh, nyooh"-/, n. 1. a region in S Egypt and the Sudan, N of Khartoum, extending from the Nile to the Red Sea. 2. Kingdom of, an ancient state in Nubia, 2000 B.C.-A.D. ...
/nooh"bee euhn, nyooh"-/, n. 1. a member of any of the various peoples inhabiting Nubia. 2. the Nilo-Saharan language of the Nubians. 3. a Nubian or black slave. 4. a Nubian ...
Nubian Desert
an arid region in the NE Sudan. * * * Desert, northeastern Sudan. It is separated from the Libyan Desert by the Nile River valley to the west. Rocky and rugged with some dunes, ...
Nubian goat
one of a breed of large, long-eared North African goats having a Roman nose and predominantly brown or black hair: noted for their rich milk. [1875-80] * * *
Nubian languages
      group of languages spoken in The Sudan (Sudan, The) and southern Egypt, chiefly along the banks of the Nile River (where Nobiin and Kenzi [Kenuzi] are spoken) but ...
Nubian Desert A desert region of northeast Sudan extending east of the Nile River to the Red Sea. * * *
—nubility /nooh bil"i tee, nyooh-/, n. /nooh"bil, -buyl, nyooh"-/, adj. 1. (of a young woman) suitable for marriage, esp. in regard to age or physical development; ...
See nubile. * * *
/nooh"beuh leuhs, nyooh"-/, adj. 1. cloudy or foggy. 2. obscure or vague; indefinite. [1525-35; < L nubilus, equiv. to nub(es) cloud + -ilus adj. suffix. See -OUS] * * *
nubuck (leather)
nubuck (leather) or nubuck [no͞o′buk΄, nyo͞o′buk΄] n. tanned leather similar to suede, but with the nap on the grain side * * *
See nucellus. * * *
—nucellar, adj. /nooh sel"euhs, nyooh-/, n., pl. nucelli /-sel"uy/. Bot. the central cellular mass of the body of the ovule, containing the embryo sac. [1880-85; < NL, equiv. ...
/noohk"flash', nyoohk"-/, n. a report of highest precedence notifying the president, secretary of defense, or their deputies of an accidental or unauthorized nuclear-weapon ...
/nooh"keuh, nyooh"-/, n., pl. nuchae /-kee/. nape. [1350-1400; < ML: nape of neck < Ar nukha' spinal marrow] * * *
See nucha. * * *
a combining form meaning "nut," used in the formation of compound words: nuciform. [comb. form repr. L nuci- (s. of nux) nut] * * *
/nooh"seuh fawrm', nyooh"-/, adj. nut-shaped. [1855-60; NUCI- + -FORM] * * *
nucle- pref. Variant of nucleo-. * * *
/nooh"klee euhr, nyooh"-/ or, by metathesis, /-kyeuh leuhr/, adj. 1. pertaining to or involving atomic weapons: nuclear war. 2. operated or powered by atomic energy: a nuclear ...
nuclear bomb
nuclear bomb n. an atomic bomb or a hydrogen bomb * * *
nuclear ceramics
Introduction       ceramic materials employed in the generation of nuclear power (nuclear energy) and in the disposal of radioactive nuclear wastes.       In their ...
nuclear clock
▪ physics       frequency standard (not useful for ordinary timekeeping) based on the extremely sharp frequency of the gamma (gamma ray) emission (electromagnetic ...
nuclear cross section
Physics. See cross section (def. 7). * * *
nuclear emulsion
Physics. a photographic emulsion in the form of a thick block, used to record the tracks of elementary particles. [1945-50] * * *
nuclear energy
energy released by reactions within atomic nuclei, as in nuclear fission or fusion. Also called atomic energy. [1925-30] * * * or atomic energy Energy released from atomic ...
nuclear engineering
Introduction       the field of engineering that deals with the control and use of energy and radiation released from nuclear reactions. It encompasses the development, ...
nuclear family
a social unit composed of father, mother, and children. Cf. extended family. [1945-50] * * * ▪ anthropology also called  elementary family    in sociology and ...
nuclear fission
fission (def. 2). [1885-90] * * * Division of a heavy atomic nucleus into two fragments of roughly equal mass, accompanied by the release of a large amount of energy, the ...
nuclear force
nuclear force n. STRONG INTERACTION * * *
nuclear fuel
1. Physics. fissile or fertile material that undergoes fission in a nuclear reactor. 2. any light element, as hydrogen or helium, that undergoes fusion and gives off energy ...
nuclear fusion
fusion (def. 4). [1895-1900] * * * Process by which nuclear reactions between light elements form heavier ones, releasing huge amounts of energy. In 1939 Hans Bethe suggested ...
nuclear isomer
Physics. isomer (def. 2). [1965-70] * * *
nuclear isomerism
Physics. isomerism (def. 2). * * *
nuclear magnetic resonance
Physics. the selective absorption of electromagnetic radiation by an atomic nucleus in the presence of a strong, static, magnetic field: used in research and in medicine to ...
nuclear magnetic resonance (NMR)
Selective absorption of very high-frequency radio waves by certain atomic nuclei subjected to a strong stationary magnetic field. Nuclei that have at least one unpaired proton ...
nuclear magneton
Physics. a unit of magnetic moment, used to measure proton spin and approximately equal to 1/1836 Bohr magneton. [1930-35] * * *
nuclear medicine
diagnostic and therapeutic medical techniques using radionuclides or radioisotopes. [1950-55] * * * Medical specialty using radioactive elements or isotopes for diagnosis and ...
nuclear membrane
Biol. the double membrane surrounding the nucleus within a cell. Also called nuclear envelope. [1885-90] * * *
nuclear model
▪ physics       any of several theoretical descriptions of the structure and function of atomic nuclei (the positively charged, dense cores of atoms). Each of the models ...
Nuclear Nonproliferation Treaty (NPT)
officially Treaty on the Nonproliferation of Nuclear Weapons International agreement intended to prevent the spread of nuclear technology. It was signed by the U.S., Britain, ...
nuclear photographic emulsion
▪ physics also called  Nuclear Emulsion,         radiation (radiation measurement) detector generally in the form of a glass plate thinly coated with a transparent ...
nuclear physics
—nuclear physicist. the branch of physics that deals with the behavior, structure, and component parts of atomic nuclei. [1930-35] * * * Branch of physics dealing with the ...
nuclear power
power derived from nuclear energy. Also called atomic power. [1925-30] * * * Energy produced by nuclear fission of heavy atomic nuclei. About one-third of all electric power ...
Nuclear properties of selected transuranium element isotopes
▪ Table Nuclear properties of selected transuranium element isotopes specific activity name and mass principal decay mode half-life disintegrations per minute per ...
nuclear radiation
Physics. radiation in the form of elementary particles emitted by an atomic nucleus, as alpha rays or gamma rays, produced by decay of radioactive substances or by nuclear ...
nuclear reaction
reaction (def. 8). * * * ▪ physics       change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle. The ...
nuclear reactor
Physics. reactor (def. 4). Also called nuclear pile. [1940-45] * * * Device that can initiate and control a self-sustaining series of nuclear-fission reactions. Neutrons ...
Nuclear Regulatory Commission
U.S. Govt. an independent agency, created in 1975, that licenses and regulates the nonmilitary use of nuclear energy. Abbr.: NRC * * * ▪ United States ...
Nuclear Regulatory Commission (NRC)
U.S. independent regulatory agency that oversees the civilian use of nuclear energy. Established in 1974 to replace the Atomic Energy Commission, the NRC licenses the ...
nuclear sap
nuclear sap n. KARYOLYMPH * * *
nuclear strategy
▪ military Introduction  the formation of tenets and strategies for producing and using nuclear weapons.       Nuclear strategy is no different from any other form of ...
Nuclear Test-Ban Treaty
an agreement signed by Britain, the Soviet Union, and the U.S. in 1963, committing nations to halt atmospheric tests of nuclear weapons: by the end of 1963, 96 additional nations ...
nuclear warhead.
a warhead containing a fission or fusion bomb. [1950-55] * * *
nuclear waste.
See radioactive waste. * * *
nuclear weapon
an explosive device whose destructive potential derives from the release of energy that accompanies the splitting or combining of atomic nuclei. [1945-50] * * * or atomic weapon ...
nuclear winter
the general devastation of life, along with worldwide darkness and extreme cold, that some scientists believe would result from a global dust cloud screening out sunlight ...
nu·cle·ar-free zone (no͞oʹklē-ər-frēʹ, nyo͞oʹ-) n. An area in which the siting of nuclear weapons or reactors is banned. * * *
nuclear age n. The atomic age. * * *
nuclear emulsion n. Any of several photographic emulsions used to detect and visually display the paths of charged subatomic particles, especially of charged cosmic ray ...
nuclear energy n. 1. The energy released by a nuclear reaction, especially by fission or fusion. 2. Nuclear energy regarded as a source of power. Also called atomic energy. * * *
nuclear envelope n. See nuclear membrane. * * *
nuclear family n. A family unit consisting of a mother and father and their children.   [From nuclear, basic, cardinal, central.] * * *
nuclear force n. Physics Strong interaction. * * *
—nuclearist, n. —nuclearistic, adj. /nooh"klee euh riz'euhm, nyooh"-/ or, by metathesis, /-kyeuh leuh-/, n. a political philosophy maintaining that nuclear weapons are the ...
See nuclearize. * * *
—nuclearization, n. /nooh"klee euh ruyz', nyooh"-/ or, by metathesis, /-kyeuh leuh-/, v.t., nuclearized, nuclearizing. to equip with nuclear weapons; give nuclear capability ...
nuclearmagnetic resonance
nuclear magnetic resonance n. Abbr. NMR The absorption of electromagnetic radiation of a specific frequency by an atomic nucleus that is placed in a strong magnetic field, used ...
nuclear magneton n. Abbr. nm A unit of the magnetic moment of a nucleon. * * *
nuclear medicine n. The branch of medicine that deals with the use of radionuclides in diagnosis and treatment of disease. * * *
nuclear membrane n. The double-layered membrane enclosing the nucleus of a cell. Also called nuclear envelope. * * *
nuclear physics n. (used with a sing. verb) The scientific study of the forces, reactions, and internal structures of atomic nuclei. * * *
nuclear power n. 1. Power, especially electricity, the source of which is nuclear fission or fusion. 2. A nation or group possessing nuclear weapons. * * *
nuclear reaction n. A reaction, as in fission, fusion, or radioactive decay, that alters the energy, composition, or structure of an atomic nucleus. * * *
nuclear reactor n. Any of several devices in which a chain reaction is initiated and controlled, with the resulting heat typically used for power generation and the neutrons and ...
nuclear weapon n. A device, such as a bomb or warhead, whose great explosive power derives from the release of nuclear energy. * * *
nuclear winter n. A worldwide darkening and cooling of the atmosphere with consequent devastation of surviving life forms, believed by some scientists to be a probable outcome of ...
/nooh"klee ays', -ayz', nyooh"-/, n. Biochem. any enzyme that catalyzes the hydrolysis of nucleic acids. [1900-05; NUCLE(IC) + -ASE] * * * ▪ biology       any enzyme ...
—nucleation /nooh'klee ay"sheuhn, nyooh'-/, n. —nucleator, n. adj. /nooh"klee it, -ayt', nyooh"-/; v. /nooh"klee ayt', nyooh"-/, adj., v., nucleated, nucleating. adj. 1. ...
nu·cle·at·ed (no͞oʹklē-ā'tĭd, nyo͞oʹ-) adj. Having a nucleus or nuclei: the nucleated cell of a spermatozoon. * * *
See nucleate. * * * ▪ crystallography       the initial process that occurs in the formation of a crystal from a solution, a liquid, or a vapour, in which a small ...
See nucleation. * * *
/nooh"klee uy', nyooh"-/, n. pl. of nucleus. [ < L nuclei, nom. pl. of nucleus; see NUCLEUS] * * *
nucleic acid
/nooh klee"ik, -klay"-, nyooh-/, Biochem. any of a group of long, linear macromolecules, either DNA or various types of RNA, that carry genetic information directing all cellular ...
nu·cle·ic acid (no͞o-klēʹĭk, -klāʹ-, nyo͞o-) n. Any of a group of complex compounds found in all living cells and viruses, composed of purines, pyrimidines, ...
nuclein [no͞o′klē in, nyo͞o′klē in] n. 〚 NUCLE( + -IN1〛 any of a group of decomposition substances found in the nuclei of cells that are intermediate to ...
See nuclein. * * *
a combining form representing nucleus, nuclear, or nucleic acid in compound words: nucleoprotein. * * *
/nooh'klee euh kap"sid, nyooh'-/, n. Microbiol. the nucleic acid core and surrounding capsid of a virus; the basic viral structure. [1960-65; NUCLEO- + CAPSID] * * *
nu·cle·o·his·tone (no͞o'klē-ō-hĭsʹtōn', nyo͞o'-) n. A nucleoprotein whose protein component is histone. * * *
/nooh"klee oyd', nyooh"-/, Microbiol. n. 1. the central region in a prokaryotic cell, as a bacterium, that contains the chromosomes and that has no surrounding membrane. adj. 2. ...
/nooh klee"euh leuhr, nyooh-, nooh'klee oh"-, nyooh'-/, adj. Cell Biol. of, pertaining to, or forming a nucleolus. [1860-65; NUCLEOL(US) + -AR1] * * *
nu·cle·o·late (no͞oʹklē-ə-lāt', nyo͞oʹ-) also nu·cle·o·lat·ed (-lā'tĭd) adj. Having a nucleolus or nucleoli.   [nucleolus + -ate1.] * * *
/nooh"klee euh lay'tid, nyooh"-, nooh klee"euh-, nyooh-/, adj. containing a nucleolus or nucleoli. Also, nucleolate. [1840-50; NUCLEOL(US) + -ATE1 + -ED3] * * *
/nooh klee"euh leuhs, nyooh-/, n., pl. nucleoli /-luy'/. Cell Biol. a conspicuous, rounded body within the nucleus of a cell. See diag. under cell. [1835-45; < LL: small kernel, ...
—nucleonic, adj. /nooh"klee on', nyooh"-/, n. Physics. a proton or neutron, esp. when considered as a component of a nucleus. [1935-40; NUCLE(US) + -ON1] * * * ▪ ...
See nucleon. * * *
/nooh'klee on"iks, nyooh'-/, n. (used with a sing. v.) the branch of science that deals with nuclear phenomena, as radioactivity, fission, or fusion, esp. practical applications, ...
nucleon number n. See mass number. * * *
nucleophile [no͞o′klē ə fīl΄, nyo͞o′klē ə fīl΄] n. 〚 NUCLEO- + -PHILE〛 an atom or molecule that has an affinity for atomic nuclei or that donates electrons to ...
—nucleophile /nooh"klee euh fuyl', nyooh"-/, n. /nooh'klee euh fil"ik, nyooh'-/, adj. Chem. of or pertaining to electron contribution in covalent bonding (opposed to ...
—nucleoplasmic, nucleoplasmatic /nooh'klee oh plaz mat"ik, nyooh'-/, adj. /nooh"klee euh plaz'euhm, nyooh"-/, n. Cell Biol. the protoplasm of the nucleus of a cell. Also called ...
See nucleoplasmic. * * *
See nucleoplasm. * * *
/nooh'klee euh proh"teen, -tee in, nyooh'-/, n. Biochem. any of the class of conjugated proteins occurring in cells and consisting of a protein combined with a nucleic acid, ...
/nooh'klee euh suy"days, -dayz, nyooh'-/, n. Biochem. any of the class of enzymes that catalyze the hydrolysis of nucleosides. [1910-15; NUCLEOSIDE + -ASE] * * *
/nooh"klee euh suyd', nyooh"-/, n. Biochem. any of the class of compounds derived by the hydrolysis of nucleic acids or nucleotides, consisting typically of deoxyribose or ribose ...
nucleoside analogue n. Any of a group of antiviral drugs, including AZT, DDC, and DDI, that interfere with the activity of the viral enzyme reverse transcriptase and are used in ...
See nucleosome. * * *
/nooh"klee euh sohm', nyooh"-/, n. Cell Biol. any of the repeating subunits of chromatin occurring at intervals along a strand of DNA, consisting of DNA coiled around ...
—nucleosynthetic /nooh'klee oh sin thet"ik, nyooh'-/, adj. /nooh'klee oh sin"theuh sis, nyooh'-/, n. Physics, Astron. the formation of new atomic nuclei by nuclear reactions, ...
See nucleosynthesis. * * *
nu·cle·o·tid·ase (no͞o'klē-ə-tīʹdās, -dāz, nyo͞o'-) n. An enzyme that catalyzes the hydrolysis of a nucleotide to a nucleoside and phosphoric acid. * * *
/nooh"klee euh tuyd', nyooh"-/, n. Biochem. any of a group of molecules that, when linked together, form the building blocks of DNA or RNA: composed of a phosphate group, the ...
/nooh"klee euhs, nyooh"-/, n., pl. nuclei /-klee uy'/, nucleuses. 1. a central part about which other parts are grouped or gathered; core: A few faithful friends formed the ...
nucleus counter.
See dust counter. * * *
/nooh"kluyd, nyooh"-/, n. Physics. 1. an atomic species in which the atoms all have the same atomic number and mass number. 2. an individual atom in such a species. [1945-50; ...
See nuclide. * * *
Welsh. /nyuudh/, n. Lludd. * * *
—nudely, adv. —nudeness, n. /noohd, nyoohd/, adj., nuder, nudest, n. adj. 1. naked or unclothed, as a person or the body. 2. without the usual coverings, furnishings, etc.; ...
Nude Descending a Staircase
a painting (1912) by Marcel Duchamp. * * *
nude mouse
a virtually hairless mutant laboratory-bred mouse having a major immune system deficiency caused by a lack of T cells, and able to accept grafts of foreign tissue. [1965-70] * * *
See nude. * * *
See nudely. * * *
nudge1 —nudger, n. /nuj/, v., nudged, nudging, n. v.t. 1. to push slightly or gently, esp. with the elbow, to get someone's attention, prod someone into action, etc. v.i. 2. to ...
See nudge1. * * *
/nooj"ee/, adj., nudgier, nudgiest. 1. of, pertaining to, or like a nudge or nag. 2. nervous; edgy. [NUDGE2 + -Y1] * * *
a combining form meaning "naked," "bare," used in the formation of compound words: nudicaul. [comb. form repr. L nudus naked; see -I-] * * *
/nooh"deuh brangk', nyooh"-/, n. a shell-less, marine snail of the suborder Nudibranchia, having external, often branched respiratory appendages on the back and sides. [1835-45; ...
See nudibranchiate. * * *
/nooh'deuh brang"kee it, -ayt', nyooh'-/, n. 1. nudibranch. adj. 2. belonging or pertaining to the nudibranchiates. Also, nudibranchian /nooh'deuh brang"kee euhn, ...
/nooh"di kawl', nyooh"-/, adj. Bot. having leafless stems. Also, nudicaulous. [NUDI- + CAUL] * * *
/nooh"dee, nyooh"-/, Informal. n. 1. a film, performance, or magazine featuring nude performers or photographs. 2. a nude person. adj. 3. featuring nude performers or ...
—nudist, n., adj. /nooh"diz euhm, nyooh"-/, n. the practice of going nude, esp. in places that allow sexually mixed groups, in the belief that such practice benefits ...
See nudism. * * *
nudist beaches
➡ seaside and beach * * *
/nooh"di tee, nyooh"-/, n., pl. nudities for 2. 1. the state or fact of being nude; nakedness. 2. something nude or naked. [1605-15; < L nuditas. See NUDE, -ITY] * * *
/nood"nik/, n. Slang. a persistently dull, boring pest. [1945-50, Amer.; < Yiddish, equiv. to nud- base of nudyen (see NUDGE2) + -nik -NIK] * * *
nudum pactum
/nooh"deuhm pak"teuhm, nyooh"-/, Law. a simple contract or promise involving no legal considerations. [ < L nudum pactum lit., bare pact] * * *
/nooj/, v.t., v.i., n. nudge2. * * *
/nooh ay"seuhs, nyooh-/, n. a river in S Texas, flowing SE to Corpus Christi Bay, on the Gulf of Mexico. 338 mi. (545 km) long. * * *
nuée ardente
Fr. /nyuu ay annrdd dahonnt"/, pl. nuées ardentes Fr. /nyuu ay zannrdd dahonnt"/. Geol. (in a volcanic eruption) a swiftly flowing, dense cloud of hot gases, ashes, and lava ...
/nooh"euhr/, n., pl. Nuers, (esp. collectively) Nuer for 1. 1. a member of a tribal people who live along the Nile in southern Sudan and subsist chiefly by raising cattle. 2. the ...
Nueva Esparta
▪ state, Venezuela       island estado (state), northeastern Venezuela. It lies off the Araya Peninsula of the mainland. Nueva Esparta consists of Margarita (Margarita ...
Nueva Gerona
/nwe"vah he rddaw"nah/ a town on the Isle of Pines, S of Cuba. 9000. * * * ▪ Cuba       city, western Cuba, located on the Isla de la Juventud in the Caribbean Sea ...
Nueva Ocotepeque
/nwe"vah aw kaw'te pe"ke/ a town in W Honduras. 4608. * * * ▪ Honduras also called  Octotepeque        town, western Honduras. It lies along the Lempa River at ...
Nueva Rosita
▪ Mexico       city, north-central Coahuila estado (state), northeastern Mexico. It is situated 1,410 feet (430 m) above sea level, just north of the Sabinas River, 65 ...
Nueva San Salvador
/nway"veuh san sal"veuh dawr', nooh ay"-/; Sp. /nwe"vah sahn sahl'vah dhawrdd"/. See Santa Tecla. * * * ▪ El Salvador also called  Santa Tecla         city, ...
▪ Cuba       port city, east-central Cuba. It lies on a peninsula jutting out into the sheltered Nuevitas Bay, into which Christopher Columbus sailed to land in the ...
Nuevo Casas Grandes
▪ Mexico       city, northern Chihuahua estado (state), northern Mexico. It lies along the Casas Grandes River, about 130 miles (210 km) southwest of Ciudad Juárez. The ...
Nuevo Laredo
/nway"voh leuh ray"doh, nooh ay"-/; Sp. /nwe"vaw lah rdde"dhaw/ a city in NE Mexico, on the Rio Grande opposite Laredo, Texas. 193,145. * * * ▪ Mexico       city and ...
Nuevo León
/nway"voh lay ohn", nooh ay"-/; Sp. /nwe"vaw le awn"/ a state in NE Mexico. 2,344,000; 25,136 sq. mi. (65,102 sq. km). Cap.: Monterrey. * * * State (pop., 2000: 3,834,141), ...
nuevo sol
▪ Peruvian currency Spanish“new sun”       monetary unit of Peru. It is divided into 100 centimos. The sol was introduced as the currency of Peru in the 1860s, but ...
Nue·vo La·re·do (no͝o-āʹvō lə-rāʹdō, nwĕʹvō lä-rĕʹdō) A city of northeast Mexico across the Rio Grande from Laredo, Texas. Founded in 1755, it was part of ...
(born William Richard Morris 1877–1963) an English businessman who was the first person in Britain to mass-produce cars (= make them in large quantities by mechanical ...
Nuffield Radio Astronomy Laboratories
/nuf"eeld/. See under Jodrell Bank. * * *
Nuffield, William Richard Morris, Viscount, Baron Nuffield Of Nuffield
▪ British industrialist born Oct. 10, 1877, Worcestershire, Eng. died Aug. 22, 1963, near Huntercombe, Henley-on-Thames, Oxfordshire       British industrialist and ...
/neuh foohd"/, n. See Nefud Desert. [1815-25] * * *
Nugaaleed Valley
▪ river valley, Somalia also called  Nogal Valley , also spelled  Nugaal Valley , Somali  Dooxo Nugaaleed        river valley, northeastern Somalia. It is a ...
—nugaciousness, n. /nooh gay"sheuhs, nyooh-/, adj. trivial; unimportant or insignificant; nugatory. [1645-55; < L nugac-, s. of nugax bungling (nug(ari) to trifle, quibble + ...
/nooh gas"i tee, nyooh-/, n., pl. nugacities for 2. 1. triviality; insignificance. 2. something insignificant or inconsequential; a trifle. [1585-95; < LL nugacitas, equiv. to ...
/nooh"guy/; Eng. /nooh"jee, nyooh"-/, n.pl. Latin. trifles. * * *
/nooh"geuh tawr'ee, -tohr'ee, nyooh"-/, adj. 1. of no real value; trifling; worthless. 2. of no force or effect; ineffective; futile; vain. 3. not valid. [1595-1605; < L ...
Nugent, Richard
▪ American writer, artist and actor in full  Richard Bruce Nugent , pseudonyms  Bruce Nugent  and  Richard Bruce  born July 2, 1906, Washington, D.C., U.S. died May 27, ...
—nuggety, adj. /nug"it/, n. 1. a lump of something, as of precious metal. 2. a lump of native gold. 3. anything of great value, significance, or the like: nuggets of wisdom. 4. ...
/noog"ee/, n. noogie. Also, nugie. * * *
/nooh"seuhns, nyooh"-/, n. 1. an obnoxious or annoying person, thing, condition, practice, etc.: a monthly meeting that was more nuisance than pleasure. 2. Law. something ...
nuisance ground
Canadian Dial. a garbage dump. [1885-90] * * *
nuisance tax
a tax paid in small but frequent amounts, usually by consumers. [1920-25] * * *
nuisance tax n. A small excise tax levied on separate purchases and collected directly from the purchaser. * * *
(in full the National Union of Journalists) (in Britain) the main trade union for people who work in newspaper and magazine journalism, publishing and broadcasting. * * *
Nujoma, Sam
▪ president of Namibia byname of  Samuel Shafiihuma Nujoma  born May 12, 1929, Owambo, South West Africa [now Namibia]       first president of independent Namibia ...
Nujoma, Sam(uel Shafiihuma)
born May 12, 1929, Owambo, South West Africa First president (from 1990) of independent Namibia. In the late 1950s Nujoma helped found the Ovamboland People's Organization, ...
/noohk, nyoohk/, n., adj., v., nuked, nuking. Informal. n. 1. a nuclear or thermonuclear weapon. 2. a nuclear power plant or nuclear reactor. 3. nuclear energy: to convert from ...
Nuku Hiva
▪ island, French Polynesia       volcanic island of the northwestern Marquesas Islands, French Polynesia, in the central South Pacific Ocean. Nuku Hiva is the ...
Town (pop., 1999 est.: 36,360), capital, and chief port of Tonga. Located on the northern shore of Tongatapu Island in the southern Pacific Ocean, it has a deep-draft harbour ...
/nooh'kooh euh law"feuh/, n. a seaport in and the capital of Tonga, in the S Pacific Ocean. 15,545. * * *
▪ atoll, Tokelau, New Zealand       coral atoll of Tokelau, a dependency of New Zealand in the South Pacific Ocean. It comprises 30 islets encircling a lagoon 8 miles ...
▪ Uzbekistan       city, southwestern Uzbekistan, capital of the Qoragalpoghiston (Karakalpakstan) republic. It lies near the head of the Amu Darya (river) delta. The ...
Nu·ku·‘a·lo·fa (no͞o'ko͞o-ə-lôʹfə) The capital of Tonga in the southwest Pacific Ocean. Population: 21,745. * * *
▪ Tonga  capital and chief port of Tonga, on the northern shore of Tongatapu Island, in the southwestern Pacific Ocean. Its deep-draft harbour is protected by reefs. ...
Nu·ku·‘a·lo·fa (no͞o'ko͞o-ə-lôʹfə) The capital of Tonga in the southwest Pacific Ocean. Population: 21,745. * * *
National Urban League. Also N.U.L. * * *
/nul/, adj. 1. without value, effect, consequence, or significance. 2. being or amounting to nothing; nil; lacking; nonexistent. 3. Math. (of a set) a. empty. b. of measure ...
null hypothesis
(in the statistical testing of a hypothesis) the hypothesis to be tested. Cf. alternative hypothesis. [1930-35] * * *
null method
a method of measurement using an electrical device, as a Wheatstone bridge, in which the quantity to be measured is balanced by an opposing known quantity that is varied until ...
null sequence
Math. a sequence that has zero as its limit. * * *
/nul"spays'/, n. Math. the set of elements of a vector space that a given linear transformation maps to zero. Also called null-manifold /nul"man'euh fohld'/. [1880-85] * * *
/nul"euh nul"euh/, n. Australian. an Aboriginal club or cudgel for use in hunting and war. [1830-40; < Dharuk na-la-na-la] * * *
/nul"euh/, n. (in the East Indies) 1. an intermittent watercourse. 2. a gully or ravine. [1770-80; < Hindi nala brook, ravine] * * *
Nullarbor Plain
Vast limestone plateau, southern Australia. It lies along the south coast of western South Australia and eastern Western Australia, extending north from the Great Australian ...
Null·ar·bor Plain (nŭlʹə-bôr', nŭl-ärʹbər) A region of south-central Australia south of the Great Victoria Desert and north of the Great Australian Bight. It is the ...
null character n. A data control character that fills computer time by adding nonsignificant zeros to a data sequence. * * *
a combining form meaning "none," "null": nullipara. [ < LL nulli- not any, none, no (comb. form of nullus NULL)] * * *
—nullificationist, nullificator, n. /nul'euh fi kay"sheuhn/, n. 1. an act or instance of nullifying. 2. the state of being nullified. 3. (often cap.) the failure or refusal of ...
See nullification. * * *
/nul'euh fid"ee euhn/, n. a person who has no faith or religion; skeptic. [1555-65; NULLI- + L fid- (s. of fides) faith + -IAN] * * *

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