| napalm | (noun) gasoline jelled with aluminum soaps; highly incendiary liquid used in fire bombs and flamethrowers | - |
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| narcism | (noun) an exceptional interest in and admiration for yourself | Synonyms: narcissism, self-love |
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| narcissism | (noun) an exceptional interest in and admiration for yourself | Synonyms: narcism, self-love |
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| narcoterrorism | (noun) the financing of terrorist activities by participation in the drug trade | - |
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| nasturtium | (noun) flowers and seeds and leaves all used as flavorings | - |
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| (noun) any tropical American plant of the genus Tropaeolum having pungent juice and long-spurred yellow to red flowers | - |
| natatorium | (noun) pool that provides a facility for swimming | Synonyms: swimming bath, swimming pool |
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| nationalism | (noun) love of country and willingness to sacrifice for it | Synonyms: patriotism |
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| (noun) the doctrine that your national culture and interests are superior to any other | - |
| (noun) the doctrine that nations should act independently (rather than collectively) to attain their goals | - |
| (noun) the aspiration for national independence felt by people under foreign domination | - |
| nativism | (noun) (philosophy) the philosophical theory that some ideas are innate | - |
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| (noun) the policy of perpetuating native cultures (in opposition to acculturation) | - |
| naturalism | (noun) (philosophy) the doctrine that the world can be understood in scientific terms without recourse to spiritual or supernatural explanations | - |
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| (noun) an artistic movement in 19th century France; artists and writers strove for detailed realistic and factual description | Synonyms: realism |
| naturism | (noun) going without clothes as a social practice | Synonyms: nudism |
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| necrophilism | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necromania, necrophilia |
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| neem | (noun) large semi-evergreen tree of the East Indies; trunk exudes a tenacious gum; bitter bark used as a tonic; seeds yield an aromatic oil; sometimes placed in genus Melia | Synonyms: arishth, Azadirachta indica, margosa, Melia Azadirachta, neem tree, nim tree |
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| negativism | (noun) characterized by habitual skepticism and a disagreeable tendency to deny or oppose or resist suggestions or commands | Synonyms: negativeness, negativity |
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| neobehaviorism | (noun) a school of psychology based on the general principles of behaviorism but broader and more flexible in concept. It stresses experimental research and laboratory analyses in the study of overt behavior and in various subjective phenomena that cannot be directly observed and measured, such as fantasies, love, stress, empathy, trust, and personality. | - |
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| neoclassicism | (noun) revival of a classical style (in art or literature or architecture or music) but from a new perspective or with a new motivation | - |
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| neocolonialism | (noun) control by a powerful country of its former colonies (or other less developed countries) by economic pressures | - |
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| neoconservatism | (noun) an approach to politics or theology that represents a return to a traditional point of view (in contrast to more liberal or radical schools of thought of the 1960s) | - |
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| neocriticism | (noun) a form of neo-Kantianism developed principally by C. B. Renouvier and his followers rejecting the noumena of Kant and restricting knowledge to phenomena as constituted by a priori categories. | - |
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| neodymium | (noun) a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium | Synonyms: atomic number 60, Nd |
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| neoevolutionism | (noun) school of anthropology concerned with long-term culture change and with the similar patterns of development that may be seen in unrelated, widely separated cultures. | Synonyms: neo-evolutionism |
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| neoexpressionism | (noun) an art movement based on expressionism; developed in 1980s in Europe and United States; crudely drawn garish paintings | - |
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| neoliberalism | (noun) a political orientation originating in the 1960s; blends liberal political views with an emphasis on economic growth | - |
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| neologism | (noun) the act of inventing a word or phrase | Synonyms: coinage, neology |
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| (noun) a newly invented word or phrase | Synonyms: coinage, neology |
| neopallium | (noun) the cortical part of the neencephalon | Synonyms: neocortex |
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| neoplasm | (noun) an abnormal new mass of tissue that serves no purpose | Synonyms: tumor, tumour |
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| neoromanticism | (noun) an art movement based on a revival of Romanticism in art and literature | - |
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| nepotism | (noun) favoritism shown to relatives or close friends by those in power (as by giving them jobs) | - |
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| neptunium | (noun) a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium | Synonyms: atomic number 93, Np |
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| nervism | (noun) the philosophical position adopted by Pavlov that all behavioral and physiological processes are regulated by the nervous system. | - |
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| neuroepithelium | (noun) epithelium associated with special sense organs and containing sensory nerve endings | - |
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| neuroticism | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, psychoneurosis |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| neutralism | (noun) a policy of neutrality or nonalignment in international affairs | - |
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| newsroom | (noun) a reading room (in a library or club) where newspapers and other periodicals can be read | - |
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| (noun) an office in which news is processed by a newspaper or news agency or television or radio station | - |
| (noun) the staff of a newspaper or the news department of a periodical | - |
| ngultrum | (noun) the basic unit of money in Bhutan | - |
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| nihilism | (noun) a revolutionary doctrine that advocates destruction of the social system for its own sake | - |
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| (noun) complete denial of all established authority and institutions | - |
| (noun) the delusion that things (or everything, including the self) do not exist; a sense that everything is unreal | Synonyms: nihilistic delusion |
| nim | (noun) game in which matchsticks are arranged in rows and players alternately remove one or more of them; in some versions the object is to take the last remaining matchstick on the table and in other versions the object is to avoid taking the last remaining matchstick on the table | - |
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| niobium | (noun) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium | Synonyms: atomic number 41, Nb |
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| nitrazepam | (noun) a hypnotic and sedative drug of the benzodiazepine type | - |
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| nitrobacterium | (noun) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates | - |
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| nitrochloroform | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: chloropicrin |
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| nm | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometer, nanometre |
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| nobelium | (noun) a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known | Synonyms: atomic number 102, No |
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| noctambulism | (noun) walking by a person who is asleep | Synonyms: noctambulation, sleepwalking, somnambulation, somnambulism |
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| nomadism | (noun) The way of life of people who, having no fixed home, move around seasonally in search of food, water and grazing etc. | - |
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| nominalism | (noun) (philosophy) the doctrine that the various objects labeled by the same term have nothing in common but their name | - |
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| nomogram | (noun) a graphic representation of numerical relations | Synonyms: nomograph |
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| noncom | (noun) a military officer appointed from enlisted personnel | Synonyms: enlisted officer, noncommissioned officer |
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| nonconformism | (noun) the practice of nonconformity | - |
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| (noun) a lack of orthodoxy in thoughts or beliefs | Synonyms: nonconformance, nonconformity |
| norm | (noun) a statistic describing the location of a distribution | Synonyms: average |
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| (noun) a standard or model or pattern regarded as typical | - |
| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| nucleoplasm | (noun) the protoplasm that constitutes the nucleus of a cell | Synonyms: karyoplasm |
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| nudism | (noun) going without clothes as a social practice | Synonyms: naturism |
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| oakum | (noun) loose hemp or jute fiber obtained by unravelling old ropes; when impregnated with tar it was used to caulk seams and pack joints in wooden ships | - |
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| obiism | (noun) belief in a kind of sorcery that originated in Africa and is practiced in the West Indies | - |
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| obscurantism | (noun) a deliberate act intended to make something obscure | - |
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| (noun) a policy of opposition to enlightenment or the spread of knowledge | - |
| obstructionism | (noun) deliberate interference | - |
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| occidentalism | (noun) the quality or customs or mannerisms characteristic of Western civilizations | - |
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| occultism | (noun) a belief in supernatural powers and the possibility of bringing them under human control | - |
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| (noun) the study of the supernatural | - |
| oculism | (noun) the craft of an oculist | - |
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| odium | (noun) hate coupled with disgust | Synonyms: abhorrence, abomination, detestation, execration, loathing |
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| (noun) state of disgrace resulting from detestable behavior | - |
| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
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| oecumenism | (noun) a movement promoting union between religions (especially between Christian churches) | Synonyms: ecumenism |
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| officialdom | (noun) people elected or appointed to administer a government | Synonyms: government officials |
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| ohm | (noun) a unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere | - |
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| olibanum | (noun) an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation | Synonyms: frankincense, gum olibanum, thus |
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| olm | (noun) European aquatic salamander with permanent external gills that lives in caves | Synonyms: Proteus anguinus |
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| omasum | (noun) the third compartment of the stomach of a ruminant | Synonyms: psalterium, third stomach |
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| omentum | (noun) a fold of peritoneum supporting the viscera | - |
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| ommatidium | (noun) any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods | - |
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| onanism | (noun) manual stimulation of the genital organs (of yourself or another) for sexual pleasure | Synonyms: masturbation |
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| (noun) a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation | Synonyms: coitus interruptus, pulling out, withdrawal, withdrawal method |
| oncidium | (noun) any orchid of the genus Oncidium: characterized by slender branching sprays of small yellow and brown flowers; often grown as houseplants | Synonyms: butterfly orchid, butterfly plant, dancing lady orchid |
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| oneirism | (noun) absentminded dreaming while awake | Synonyms: air castle, castle in Spain, castle in the air, daydream, daydreaming, reverie, revery |
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| operationalism | (noun) (philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it | - |
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| operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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| ophidism | (noun) poisoning by snake venom | - |
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| opium | (noun) an addictive narcotic extracted from seed capsules of the opium poppy | - |
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| opossum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: possum |
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| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: phalanger, possum |
| opportunism | (noun) taking advantage of opportunities without regard for the consequences for others | Synonyms: expedience, self-interest, self-seeking |
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| opprobrium | (noun) a state of extreme dishonor | Synonyms: infamy |
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| (noun) state of disgrace resulting from public abuse | Synonyms: obloquy |
| optimism | (noun) a general disposition to expect the best in all things | - |
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| (noun) the optimistic feeling that all is going to turn out well | - |
| optimum | (noun) most favorable conditions or greatest degree or amount possible under given circumstances | - |
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| organicism | (noun) theory that the total organization of an organism rather than the functioning of individual organs is the determinant of life processes | - |
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| organism | (noun) a living thing that has (or can develop) the ability to act or function independently | Synonyms: being |
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| (noun) a system considered analogous in structure or function to a living body | - |
| orgasm | (noun) the moment of most intense pleasure in sexual intercourse | Synonyms: climax, coming, sexual climax |
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| orientalism | (noun) the quality or customs or mannerisms characteristic of Asian civilizations | - |
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| origanum | (noun) any of various fragrant aromatic herbs of the genus Origanum used as seasonings | - |
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| originalism | (noun) the belief that the United States Constitution should be interpreted in the way the authors originally intended it | - |
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| ornamentalism | (noun) the practice of ornamental display | - |
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| oscillogram | (noun) the recording produced by an oscillograph | - |
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| osmiridium | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: iridosmine |
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| osmium | (noun) a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known | Synonyms: atomic number 76, Os |
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| ossiculum | (noun) a small bone; especially one in the middle ear | Synonyms: bonelet, ossicle |
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| ostensorium | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: monstrance |
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| ostracism | (noun) the act of excluding someone from society by general consent | - |
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| (noun) the state of being banished or ostracized (excluded from society by general consent) | Synonyms: banishment, Coventry |
| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| ovum | (noun) the female reproductive cell; the female gamete | Synonyms: egg cell |
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| oxazepam | (noun) a tranquilizing drug (trade name Serax) used to treat anxiety and insomnia and alcohol withdrawal | Synonyms: Serax |
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| pablum | (noun) worthless or oversimplified ideas | Synonyms: pap |
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| pabulum | (noun) insipid intellectual nourishment | - |
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| (noun) any substance that can be used as food | Synonyms: comestible, eatable, edible, victual, victuals |