| nineteenth | (adjective) coming next after the eighteenth in position | Synonyms: 19th |
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| (noun) position 19 in a countable series of things | - |
| nineties | (noun) the time of life between 90 and 100 | Synonyms: mid-nineties |
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| (noun) the decade from 1990 to 1999 | Synonyms: 1990s |
| (noun) the decade from 1890 to 1899 | Synonyms: 1890s |
| ninetieth | (adjective) the ordinal number of ninety in counting order | Synonyms: 90th |
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| (noun) position 90 in a countable series of things | - |
| ninety | (adjective) being ten more than eighty | Synonyms: 90, xc |
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| (noun) the cardinal number that is the product of ten and nine | Synonyms: 90, XC |
| ninja | (noun) a class of 14th century Japanese who were trained in martial arts and were hired for espionage and assassinations | - |
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| (noun) a member of the ninja who were trained in martial arts and hired for espionage or sabotage or assassinations; a person skilled in ninjutsu | - |
| ninjitsu | (noun) the traditional Japanese method of espionage; involves stealthy movements and the use of camouflage | Synonyms: ninjutsu |
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| ninjutsu | (noun) the traditional Japanese method of espionage; involves stealthy movements and the use of camouflage | Synonyms: ninjitsu |
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| ninny | (noun) a stupid foolish person | Synonyms: nincompoop, poop |
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| ninon | (noun) a fine strong sheer silky fabric made of silk or rayon or nylon | - |
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| ninth | (adjective) coming next after the eighth and just before the tenth in position | Synonyms: 9th |
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| (noun) one part in nine equal parts | Synonyms: one-ninth |
| (noun) position nine in a countable series of things | - |
| niobite | (noun) a black mineral that is an ore of niobium and tantalum | Synonyms: columbite |
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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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| nip | (noun) a small sharp bite or snip | Synonyms: pinch |
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| (noun) a tart spicy quality | Synonyms: piquance, piquancy, piquantness, tang, tanginess, zest |
| (noun) the property of being moderately cold | Synonyms: chilliness, coolness |
| (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, flavour, relish, sapidity, savor, savour, smack, tang |
| (noun) a small drink of liquor | Synonyms: shot |
| (verb) squeeze tightly between the fingers | Synonyms: pinch, squeeze, tweet, twinge, twitch |
| (verb) sever or remove by pinching or snipping | Synonyms: clip, nip off, snip, snip off |
| (verb) give a small sharp bite to | - |
| nipa | (noun) made from sap of the Australasian nipa palm | - |
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| nipper | (noun) a grasping structure on the limb of a crustacean or other arthropods | Synonyms: chela, claw, pincer |
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| (noun) a young person of either sex | Synonyms: child, fry, kid, minor, nestling, shaver, small fry, tiddler, tike, tyke, youngster |
| nipping | (adjective) pleasantly cold and invigorating | Synonyms: crisp, frosty, nippy, snappy |
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| (adjective) capable of wounding | Synonyms: barbed, biting, mordacious, pungent |
| nipple | (noun) a flexible cap on a baby's feeding bottle or pacifier | - |
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| (noun) the small projection of a mammary gland | Synonyms: mamilla, mammilla, pap, teat, tit |
| nippy | (adjective) pleasantly cold and invigorating | Synonyms: crisp, frosty, nipping, snappy |
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| (adjective) a sharp biting taste | - |
| niqaabi | (noun) an observant Muslim woman who covers her face and hands when in public or in the presence of any man outside her immediate family | - |
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| niqab | (noun) a face veil covering the lower part of the face (up to the eyes) worn by observant Muslim women | - |
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| nirvana | (noun) any place of complete bliss and delight and peace | Synonyms: Eden, heaven, paradise, promised land, Shangri-la |
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| (noun) (Hinduism and Buddhism) the beatitude that transcends the cycle of reincarnation; characterized by the extinction of desire and suffering and individual consciousness | Synonyms: enlightenment |
| nisi | (adjective) not final or absolute | - |
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| nisus | (noun) an effortful attempt to attain a goal | Synonyms: pains, strain, striving |
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| nit | (noun) egg or young of an insect parasitic on mammals especially a sucking louse; often attached to a hair or item of clothing | - |
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| (noun) a luminance unit equal to 1 candle per square meter measured perpendicular to the rays from the source | - |
| niter | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: nitre, potassium nitrate, saltpeter, saltpetre |
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| nitid | (adjective) bright with a steady but subdued shining | Synonyms: agleam, gleaming |
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| nitpick | (verb) be overly critical; criticize minor details | - |
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| nitpicker | (noun) someone who makes small and unjustified criticisms | - |
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| nitramine | (noun) a yellow crystalline explosive solid that is used in detonators | Synonyms: tetryl |
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| nitrate | (noun) any compound containing the nitrate group (such as a salt or ester of nitric acid) | - |
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| (verb) treat with nitric acid, so as to change an organic compound into a nitrate | - |
| nitrazepam | (noun) a hypnotic and sedative drug of the benzodiazepine type | - |
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| nitre | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: niter, potassium nitrate, saltpeter, saltpetre |
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| 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 |