| nitric | (adjective) of or containing nitrogen | Synonyms: azotic, nitrous |
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| nitride | (noun) a compound containing nitrogen and a more electropositive element (such as phosphorus or a metal) | - |
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| nitrification | (noun) the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants) | - |
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| (noun) the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound) | - |
| nitrify | (verb) treat (soil) with nitrates | - |
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| (verb) treat with nitrogen or a nitrogen compound | Synonyms: nitrogenise, nitrogenize |
| (verb) convert into nitric acid, nitrous acid, or nitrate, especially with the action of nitrobacteria | - |
| nitril | (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: cyanide, nitrile |
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| nitrile | (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: cyanide, nitril |
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| nitrite | (noun) the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid) | - |
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| nitrobacteria | (noun) soil bacteria that convert nitrites to nitrates | Synonyms: nitric bacteria |
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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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| nitrobenzene | (noun) a poisonous oily water-soluble liquid used as a solvent and in the manufacture of aniline | - |
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| nitrocalcite | (noun) the mineral form of calcium nitrate | - |
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| nitrocellulose | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocotton |
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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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| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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| nitrocotton | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocellulose |
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| nitrofuran | (noun) derivative of furan used to inhibit bacterial growth | - |
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| nitrofurantoin | (noun) derivative of nitrofuran used as an antibacterial medicine (trade name Macrodantin) effective against a broad range of Gram-positive and Gram-negative bacteria; used to treat infections of the urinary tract | Synonyms: Macrodantin |
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| nitrogen | (noun) a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues | Synonyms: atomic number 7, N |
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| nitrogenase | (noun) an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia | - |
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| nitrogenise | (verb) treat with nitrogen or a nitrogen compound | Synonyms: nitrify, nitrogenize |
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| nitrogenize | (verb) treat with nitrogen or a nitrogen compound | Synonyms: nitrify, nitrogenise |
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| nitrogenous | (adjective) of or relating to or containing nitrogen | Synonyms: nitrogen-bearing |
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| nitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerine, Nitrospan, Nitrostat, trinitroglycerin |
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| nitroglycerine | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, Nitrospan, Nitrostat, trinitroglycerin |
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| nitrosobacteria | (noun) soil bacteria that oxidize ammonia to nitrites | Synonyms: nitrous bacteria |
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| nitrous | (adjective) of or containing nitrogen | Synonyms: azotic, nitric |
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| nitweed | (noun) annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers | Synonyms: Hypericum gentianoides, orange grass, pine-weed, pineweed |
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| nitwit | (noun) a stupid incompetent person | Synonyms: dimwit, doofus, half-wit |
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| nitwitted | (adjective) (of especially persons) lacking sense or understanding or judgment | Synonyms: senseless, soft-witted, witless |
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| nix | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nothing, null, zero, zilch, zip, zippo |
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| (verb) command against | Synonyms: disallow, forbid, interdict, prohibit, proscribe, veto |
| nm | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometer, nanometre |
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| no | (adjective) (quantifier) used with either mass nouns or plural count nouns for indicating a complete or almost complete lack or zero quantity of | - |
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| (noun) a negative | - |
| (adverb) used to express refusal or denial or disagreement etc or especially to emphasize a negative statement | - |
| (adverb) not in any degree or manner; not at all | - |
| (adverb) referring to the degree to which a certain quality is present | Synonyms: no more |
| nob | (noun) informal term for an upper-class or wealthy person | Synonyms: toff |
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| nobble | (verb) disable by drugging | - |
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| (verb) take away to an undisclosed location against their will and usually in order to extract a ransom | Synonyms: abduct, kidnap, snatch |
| (verb) make off with belongings of others | Synonyms: abstract, cabbage, filch, hook, lift, pilfer, pinch, purloin, snarf, sneak, swipe |
| (verb) deprive of by deceit | Synonyms: bunco, con, defraud, diddle, goldbrick, hornswoggle, mulct, rook, scam, short-change, swindle, victimize |
| 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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| nobility | (noun) the quality of elevation of mind and exaltation of character or ideals or conduct | Synonyms: grandeur, magnanimousness, nobleness |
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| (noun) a privileged class holding hereditary titles | Synonyms: aristocracy |
| (noun) the state of being of noble birth | Synonyms: noblesse |
| noble | (adjective) having or showing or indicative of high or elevated character | - |
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| (adjective) of or belonging to or constituting the hereditary aristocracy especially as derived from feudal times | - |
| (adjective) impressive in size, manner, or appearance | Synonyms: baronial, imposing, stately |
| (adjective) inert especially toward oxygen | - |
| (noun) a titled peer of the realm | Synonyms: Lord, nobleman |
| nobleman | (noun) a titled peer of the realm | Synonyms: Lord, noble |
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| nobleness | (noun) the quality of elevation of mind and exaltation of character or ideals or conduct | Synonyms: grandeur, magnanimousness, nobility |
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| noblesse | (noun) members of the nobility (especially of the French nobility) | - |
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| (noun) the state of being of noble birth | Synonyms: nobility |
| noblewoman | (noun) a woman of the peerage in Britain | Synonyms: Lady, peeress |
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| nobly | (adverb) in a noble manner | - |
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| nobody | (noun) a person of no influence | Synonyms: cipher, cypher, nonentity |
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| nocent | (adjective) having a tendency to cause harm | - |
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| nociceptive | (adjective) caused by or in response to pain | - |
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| nock | (verb) make small marks into the surface of | Synonyms: mark, score |
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| noctambulation | (noun) walking by a person who is asleep | Synonyms: noctambulism, sleepwalking, somnambulation, somnambulism |
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| noctambulism | (noun) walking by a person who is asleep | Synonyms: noctambulation, sleepwalking, somnambulation, somnambulism |
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| noctambulist | (noun) someone who walks about in their sleep | Synonyms: sleepwalker, somnambulist |
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| noctiluca | (noun) large bioluminescent marine protozoan | Synonyms: Noctiluca miliaris |
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| noctilucent | (adjective) shining or glowing by night | - |
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| noctuid | (noun) usually dull-colored medium-sized nocturnal moth; the usually smooth-bodied larvae are destructive agricultural pests | Synonyms: noctuid moth, owlet moth |
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| nocturia | (noun) excessive urination at night; especially common in older men | Synonyms: nycturia |
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| nocturnal | (adjective) belonging to or active during the night | - |
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| (adjective) of or relating to or occurring in the night | - |
| nocturnally | (adverb) at night | - |
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| nocturne | (noun) a pensive lyrical piece of music (especially for the piano) | Synonyms: notturno |
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| nod | (noun) the act of nodding the head | - |
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| (noun) a sign of assent or salutation or command | - |
| (verb) be almost asleep | - |
| (verb) let the head fall forward through drowsiness | - |
| (verb) lower and raise the head, as to indicate assent or agreement or confirmation | - |
| (verb) express or signify by nodding | - |
| (verb) sway gently back and forth, as in a nodding motion | - |
| nodding | (adjective) having branches or flower heads that bend downward | Synonyms: cernuous, drooping, pendulous, weeping |
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| noddle | (noun) an informal British expression for head or mind | - |
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| node | (noun) (computer science) any computer that is hooked up to a computer network | Synonyms: client, guest |
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| (noun) any bulge or swelling of an anatomical structure or part | - |
| (noun) the source of lymph and lymphocytes | Synonyms: lymph gland, lymph node |
| (noun) (astronomy) a point where an orbit crosses a plane | - |
| (noun) (physics) the point of minimum displacement in a periodic system | - |
| (noun) (botany) the small swelling that is the part of a plant stem from which one or more leaves emerge | Synonyms: leaf node |
| (noun) any thickened enlargement | Synonyms: knob, thickening |
| (noun) a connecting point at which several lines come together | - |
| nodular | (adjective) relating to or characterized by or having nodules | - |
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| (adjective) having nodules or occurring in the form of nodules | Synonyms: nodulated, noduled |
| nodulated | (adjective) having nodules or occurring in the form of nodules | Synonyms: nodular, noduled |
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| nodule | (noun) a small node | - |
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| (noun) (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment) | - |
| (noun) small rounded wartlike protuberance on a plant | Synonyms: tubercle |
| noduled | (adjective) having nodules or occurring in the form of nodules | Synonyms: nodular, nodulated |
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| nodulose | (adjective) having minute nodules | - |
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| noesis | (noun) the psychological result of perception and learning and reasoning | Synonyms: cognition, knowledge |
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| noetic | (adjective) of or associated with or requiring the use of the mind | Synonyms: intellectual, rational |
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| nog | (noun) a wooden block built into a masonry wall so that joinery structure can be nailed to it | - |
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| (noun) a wooden pin pushed or driven into a surface | Synonyms: peg |
| noggin | (noun) informal terms for a human head | Synonyms: attic, bean, bonce, dome, noodle |
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| nogging | (noun) rough brick masonry used to fill in the gaps in a wooden frame | - |
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| nohow | (adverb) in no manner; in no way | - |
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| noise | (noun) the quality of lacking any predictable order or plan | Synonyms: haphazardness, randomness, stochasticity |
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| (noun) incomprehensibility resulting from irrelevant information or meaningless facts or remarks | - |
| (noun) the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience | Synonyms: dissonance, racket |
| (noun) a loud outcry of protest or complaint | - |
| (noun) sound of any kind (especially unintelligible or dissonant sound) | - |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, interference |
| (verb) emit a noise | Synonyms: make noise, resound |
| noiseless | (adjective) making no sound | - |
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| noiselessly | (adverb) without a sound | Synonyms: soundlessly |
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| noiselessness | (noun) the property of making no noise | - |
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| noisemaker | (noun) a device (such as a clapper or bell or horn) used to make a loud noise at a celebration | - |
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| noisily | (adverb) with much noise or loud and unpleasant sound | - |
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| noisiness | (noun) the auditory effect characterized by loud and constant noise | Synonyms: racketiness |
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| noisome | (adjective) offensively malodorous | Synonyms: fetid, foetid, foul-smelling, foul, funky, ill-scented, smelly, stinking |
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| (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, nauseous, offensive, queasy, sickening, vile |
| noisomeness | (noun) the quality of being noxious | Synonyms: harmfulness, noxiousness |
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| noisy | (adjective) full of or characterized by loud and nonmusical sounds | - |
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| (adjective) attracting attention by showiness or bright colors | - |
| noma | (noun) acute ulceration of the mucous membranes of the mouth or genitals; often seen in undernourished children | - |
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| nomad | (noun) a member of a people who have no permanent home but move about according to the seasons | - |
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| nomadic | (adjective) migratory | Synonyms: mobile, peregrine, roving, wandering |
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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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| nombril | (noun) the center point on a shield | - |
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| nomenclature | (noun) a system of words used to name things in a particular discipline | Synonyms: language, terminology |
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| nomenklatura | (noun) the system of patronage in communist countries; controlled by committees in the Communist Party | - |
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| nomia | (noun) a genus of bee; some are important pollinators of legumes | Synonyms: genus Nomia |
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| nominal | (adjective) of, relating to, or characteristic of an amount that is not adjusted for inflation | - |
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| (adjective) pertaining to a noun or to a word group that functions as a noun | - |
| (adjective) relating to or constituting or bearing or giving a name | - |
| (adjective) existing in name only | Synonyms: titular |
| (adjective) insignificantly small; a matter of form only (`tokenish' is informal) | Synonyms: token, tokenish |
| (adjective) named; bearing the name of a specific person | Synonyms: nominative |
| (noun) a phrase that can function as the subject or object of a verb | Synonyms: nominal phrase, noun phrase |
| 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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| nominalist | (noun) a philosopher who has adopted the doctrine of nominalism | - |
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| nominalistic | (adjective) of or relating to nominalism | - |
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| nominally | (adverb) in name only | - |
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| nominate | (verb) propose as a candidate for some honor | Synonyms: put forward, put up |
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| (verb) create and charge with a task or function | Synonyms: appoint, constitute, name |
| (verb) charge with a function; charge to be | Synonyms: make, name |
| (verb) put forward; nominate for appointment to an office or for an honor or position | Synonyms: propose |
| nominated | (adjective) appointed by nomination | Synonyms: nominative |
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| nomination | (noun) the act of officially naming a candidate | - |
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| (noun) an address (usually at a political convention) proposing the name of a candidate to run for election | Synonyms: nominating address, nominating speech |
| (noun) the condition of having been proposed as a suitable candidate for appointment or election | - |
| nominative | (adjective) serving as or indicating the subject of a verb and words identified with the subject of a copular verb | - |
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| (adjective) appointed by nomination | Synonyms: nominated |
| (adjective) named; bearing the name of a specific person | Synonyms: nominal |
| (noun) the category of nouns serving as the grammatical subject of a verb | Synonyms: nominative case, subject case |
| nominator | (noun) someone who proposes a candidate for appointment or election | - |
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| nominee | (noun) a politician who is running for public office | Synonyms: campaigner, candidate |
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