| nidation | (noun) (embryology) the organic process whereby a fertilized egg becomes implanted in the lining of the uterus of placental mammals | Synonyms: implantation |
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| nidus | (noun) a nest in which spiders or insects deposit their eggs | - |
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| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, focus |
| niece | (noun) a daughter of your brother or sister | - |
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| nierembergia | (noun) any of various plants of the genus Nierembergia having upturned bell-shaped flowers | Synonyms: cupflower |
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| nifedipine | (noun) calcium blocker (trade name Procardia); appears to increase the risk of recurrent heart attacks | Synonyms: Procardia |
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| niff | (noun) an unpleasant smell | Synonyms: pong |
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| nigella | (noun) any plant of the genus Nigella | - |
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| nigga | (noun) (ethnic slur) extremely offensive name for a Black person | Synonyms: jigaboo, nigger, nigra |
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| niggard | (noun) a selfish person who is unwilling to give or spend | Synonyms: churl, scrooge, skinflint |
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| niggardliness | (noun) extreme stinginess | Synonyms: closeness, meanness, minginess, niggardness, parsimoniousness, parsimony, tightfistedness, tightness |
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| niggardness | (noun) extreme stinginess | Synonyms: closeness, meanness, minginess, niggardliness, parsimoniousness, parsimony, tightfistedness, tightness |
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| nigger | (noun) (ethnic slur) extremely offensive name for a Black person | Synonyms: jigaboo, nigga, nigra |
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| niggler | (noun) someone who constantly criticizes in a petty way | Synonyms: carper |
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| night | (noun) darkness | - |
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| (noun) the time after sunset and before sunrise while it is dark outside | Synonyms: dark, nighttime |
| (noun) a period of ignorance or backwardness or gloom | - |
| (noun) the dark part of the diurnal cycle considered a time unit | - |
| (noun) the time between sunset and midnight | - |
| (noun) the period spent sleeping | - |
| (noun) a shortening of nightfall | - |
| nightbird | (noun) a person who likes to be active late at night | Synonyms: night owl, nighthawk |
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| nightcap | (noun) the final game of a double header | - |
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| (noun) a cloth cap worn in bed | - |
| (noun) an alcoholic drink taken at bedtime; often alcoholic | - |
| nightclothes | (noun) garments designed to be worn in bed | Synonyms: nightwear, sleepwear |
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| nightclub | (noun) a spot that is open late at night and that provides entertainment (as singers or dancers) as well as dancing and food and drink | Synonyms: cabaret, club, night club, nightspot |
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| nightcrawler | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: angleworm, crawler, dew worm, earthworm, fishing worm, fishworm, nightwalker, red worm, wiggler |
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| nightdress | (noun) lingerie consisting of a loose dress designed to be worn in bed by women | Synonyms: gown, night-robe, nightgown, nightie |
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| nightfall | (noun) the time of day immediately following sunset | Synonyms: crepuscle, crepuscule, dusk, evenfall, fall, gloam, gloaming, twilight |
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| nightgown | (noun) lingerie consisting of a loose dress designed to be worn in bed by women | Synonyms: gown, night-robe, nightdress, nightie |
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| nighthawk | (noun) mainly nocturnal North American goatsucker | Synonyms: bullbat, mosquito hawk |
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| (noun) a person who likes to be active late at night | Synonyms: night owl, nightbird |
| nightie | (noun) lingerie consisting of a loose dress designed to be worn in bed by women | Synonyms: gown, night-robe, nightdress, nightgown |
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| nightingale | (noun) European songbird noted for its melodious nocturnal song | Synonyms: Luscinia megarhynchos |
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| nightjar | (noun) mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects | Synonyms: caprimulgid, goatsucker |
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| nightlife | (noun) the activity of people seeking nighttime diversion (as at the theater, a nightclub, etc.) | Synonyms: night life |
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| (noun) the entertainment available to people seeking nighttime diversion | Synonyms: night life |
| nightmare | (noun) a terrifying or deeply upsetting dream | - |
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| (noun) a situation resembling a terrifying dream | Synonyms: incubus |
| nightmarishness | (noun) The property of being extremely bad, miserable, difficult or terrifying; resembling a nightmare. | Synonyms: hellishness |
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| nightrider | (noun) member of a secret mounted band in United States South after the American Civil War; committed acts of intimidation and revenge | Synonyms: night rider |
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| nightshade | (noun) any of numerous shrubs or herbs or vines of the genus Solanum; most are poisonous though many bear edible fruit | - |
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| nightshirt | (noun) nightclothes worn by men | - |
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| nightspot | (noun) a spot that is open late at night and that provides entertainment (as singers or dancers) as well as dancing and food and drink | Synonyms: cabaret, club, night club, nightclub |
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| nightstick | (noun) a short stout club used primarily by policemen | Synonyms: baton, billy, billy club, billystick, truncheon |
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| nighttime | (noun) the time after sunset and before sunrise while it is dark outside | Synonyms: dark, night |
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| nightwalker | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: angleworm, crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, red worm, wiggler |
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| nightwear | (noun) garments designed to be worn in bed | Synonyms: nightclothes, sleepwear |
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| nightwork | (noun) work to be done at night | - |
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| nigra | (noun) (ethnic slur) extremely offensive name for a Black person | Synonyms: jigaboo, nigga, nigger |
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| nihil | (noun) (Latin) nil; nothing (as used by a sheriff after an unsuccessful effort to serve a writ) | - |
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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 |
| nihilist | (noun) an advocate of anarchism | Synonyms: anarchist, syndicalist |
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| (noun) someone who rejects all theories of morality or religious belief | - |
| nihility | (noun) the state of nonexistence | Synonyms: nothingness, nullity, void |
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| nil | (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, nix, nothing, null, zero, zilch, zip, zippo |
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| nilgai | (noun) large Indian antelope; male is blue-grey with white markings; female is brownish with no horns | Synonyms: blue bull, Boselaphus tragocamelus, nylghai, nylghau |
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| 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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| nimbleness | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: agility, legerity, lightness, lightsomeness |
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| (noun) intelligence as revealed by quickness and alertness of mind | Synonyms: mental dexterity |
| nimblewill | (noun) slender branching American grass of some value for grazing in central United States | Synonyms: Muhlenbergia schreberi, nimble Will |
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| nimbus | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, aureole, gloriole, glory, halo |
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| (noun) a dark grey cloud bearing rain | Synonyms: nimbus cloud, rain cloud |
| nimiety | (noun) a quantity much larger than is needed | Synonyms: excess, surplus, surplusage |
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| nincompoop | (noun) a stupid foolish person | Synonyms: ninny, poop |
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| nine | (noun) one of four playing cards in a deck with nine pips on the face | Synonyms: nine-spot |
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| (noun) a team of professional baseball players who play and travel together | Synonyms: ball club, baseball club, club |
| (noun) the cardinal number that is the sum of eight and one | Synonyms: 9, ennead, IX, Nina from Carolina, niner |
| ninepence | (noun) a coin worth nine pennies | - |
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| ninepin | (noun) a bowling pin of the type used in playing ninepins or (in England) skittles | Synonyms: skittle, skittle pin |
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| ninepins | (noun) a bowling game that is played by rolling a bowling ball down a bowling alley at a target of nine wooden pins | Synonyms: skittles |
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| niner | (noun) the cardinal number that is the sum of eight and one | Synonyms: 9, ennead, IX, Nina from Carolina, nine |
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| nineteen | (noun) the cardinal number that is the sum of eighteen and one | Synonyms: 19, XIX |
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| nineteenth | (noun) position 19 in a countable series of things | - |
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| 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 | (noun) position 90 in a countable series of things | - |
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| ninety | (noun) the cardinal number that is the product of ten and nine | Synonyms: 90, XC |
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| 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 | (noun) one part in nine equal parts | Synonyms: one-ninth |
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| (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 |
| 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 |
| 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 |
| 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 |
| 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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| 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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| 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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| 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) | - |
| 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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