| quack | (noun) the harsh sound of a duck | - |
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| (noun) an untrained person who pretends to be a physician and who dispenses medical advice | - |
| quackery | (noun) medical practice and advice based on observation and experience in ignorance of scientific findings | Synonyms: empiricism |
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| (noun) the dishonesty of a charlatan | Synonyms: charlatanism |
| quackgrass | (noun) European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed | Synonyms: Agropyron repens, couch grass, dog grass, quack grass, quick grass, witch grass, witchgrass |
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| quad | (noun) a rectangular area surrounded on all sides by buildings | Synonyms: quadrangle |
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| (noun) (printing) a block of type without a raised letter; used for spacing between words or sentences | Synonyms: space |
| (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quadriceps, quadriceps femoris |
| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quadruplet |
| quadrangle | (noun) a rectangular area surrounded on all sides by buildings | Synonyms: quad |
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| (noun) a four-sided polygon | Synonyms: quadrilateral, tetragon |
| quadrant | (noun) a measuring instrument for measuring altitude of heavenly bodies | - |
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| (noun) the area enclosed by two perpendicular radii of a circle | - |
| (noun) any of the four areas into which a plane is divided by two orthogonal coordinate axes | - |
| (noun) a quarter of the circumference of a circle | Synonyms: quarter-circle |
| quadrantanopia | (noun) blindness in one fourth of the visual field | - |
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| quadraphony | (noun) a stereophonic sound recording or reproducing system using four separate channels | Synonyms: quadraphonic system, quadriphonic system |
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| quadrate | (noun) a square-shaped object | - |
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| (noun) a cubelike object | - |
| quadratic | (noun) a polynomial of the second degree | Synonyms: quadratic polynomial |
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| (noun) an equation in which the highest power of an unknown quantity is a square | Synonyms: quadratic equation |
| quadratics | (noun) a branch of algebra dealing with quadratic equations | - |
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| quadrature | (noun) the construction of a square having the same area as some other figure | - |
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| quadrennium | (noun) a period of four years | - |
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| quadric | (noun) a curve or surface whose equation (in Cartesian coordinates) is of the second degree | Synonyms: quadric surface |
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| quadriceps | (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quad, quadriceps femoris |
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| quadrilateral | (noun) a four-sided polygon | Synonyms: quadrangle, tetragon |
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| quadrille | (noun) a square dance of 5 or more figures for 4 or more couples | - |
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| (noun) music for dancing the quadrille | - |
| quadrillion | (noun) the number that is represented as a one followed by 15 zeros | - |
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| (noun) the number that is represented as a one followed by 24 zeros in the UK | - |
| quadrillionth | (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
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| quadripara | (noun) (obstetrics) woman who has given birth to a viable infant in each of four pregnancies | - |
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| quadriplegia | (noun) paralysis of both arms and both legs | - |
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| quadriplegic | (noun) a person who is paralyzed in both arms and both legs | - |
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| quadrivium | (noun) (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy | - |
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| quadroon | (noun) an offspring of a mulatto and a white parent; a person who is one-quarter black | - |
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| quadrumvirate | (noun) a group of four men | - |
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| quadruped | (noun) an animal especially a mammal having four limbs specialized for walking | - |
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| quadruple | (noun) a quantity that is four times as great as another | - |
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| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| quadruplet | (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quartet, quartette |
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| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quad |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| quadruplicate | (noun) any four copies; any of four things that correspond to one another exactly | - |
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| quadrupling | (noun) increase by a factor of four | - |
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| quaestor | (noun) any of several public officials of ancient Rome (usually in charge of finance and administration) | - |
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| quaff | (noun) a hearty draft | - |
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| quaffer | (noun) a person who drinks heartily | - |
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| quag | (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quagmire, slack |
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| quagga | (noun) mammal of South Africa that resembled a zebra; extinct since late 19th century | Synonyms: Equus quagga |
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| quagmire | (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quag, slack |
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| quahaug | (noun) an edible American clam; the heavy shells were used as money by some American Indians | Synonyms: hard-shell clam, hard clam, Mercenaria mercenaria, quahog, round clam, Venus mercenaria |
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| (noun) Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes | Synonyms: hard-shell clam, quahog, round clam |
| quahog | (noun) an edible American clam; the heavy shells were used as money by some American Indians | Synonyms: hard-shell clam, hard clam, Mercenaria mercenaria, quahaug, round clam, Venus mercenaria |
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| (noun) Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes | Synonyms: hard-shell clam, quahaug, round clam |
| quail | (noun) small gallinaceous game birds | - |
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| (noun) flesh of quail; suitable for roasting or broiling if young; otherwise must be braised | - |
| quaintness | (noun) strangeness as a consequence of being old fashioned | - |
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| (noun) the quality of being quaint and old-fashioned | - |
| quake | (noun) shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity | Synonyms: earthquake, seism, temblor |
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| quaker | (noun) one who quakes and trembles with (or as with) fear | Synonyms: trembler |
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| qualification | (noun) the act of modifying or changing the strength of some idea | - |
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| (noun) an attribute that must be met or complied with and that fits a person for something | Synonyms: making |
| (noun) a statement that limits or restricts some claim | Synonyms: reservation |
| qualifier | (noun) a content word that qualifies the meaning of a noun or verb | Synonyms: modifier |
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| (noun) a contestant who meets certain requirements and so qualifies to take part in the next stage of competition | - |
| qualifying | (noun) success in satisfying a test or requirement | Synonyms: pass, passing |
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| (noun) the grammatical relation that exists when a word qualifies the meaning of the phrase | Synonyms: limiting, modification |
| quality | (noun) an essential and distinguishing attribute of something or someone | - |
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| (noun) (music) the distinctive property of a complex sound (a voice or noise or musical sound) | Synonyms: timber, timbre, tone |
| (noun) a degree or grade of excellence or worth | Synonyms: caliber, calibre |
| (noun) a characteristic property that defines the apparent individual nature of something | Synonyms: character, lineament |
| (noun) high social status | - |
| qualm | (noun) uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety) | Synonyms: misgiving, scruple |
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| (noun) a mild state of nausea | Synonyms: queasiness, squeamishness |
| quamash | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camass, camosh |
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| quandang | (noun) red Australian fruit; used for dessert or in jam | Synonyms: native peach, quandong, quantong |
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| (noun) Australian tree with edible flesh and edible nutlike seed | Synonyms: Eucarya acuminata, Fusanus acuminatus, quandong, quandong tree |
| quandary | (noun) state of uncertainty or perplexity especially as requiring a choice between equally unfavorable options | Synonyms: dilemma |
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| (noun) a situation from which extrication is difficult especially an unpleasant or trying one | Synonyms: plight, predicament |
| quandong | (noun) red Australian fruit; used for dessert or in jam | Synonyms: native peach, quandang, quantong |
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| (noun) Australian tree having hard white timber and glossy green leaves with white flowers followed by one-seeded glossy blue fruit | Synonyms: blue fig, Brisbane quandong, Elaeocarpus grandis, quandong tree, silver quandong tree |
| (noun) the fruit of the Brisbane quandong tree | Synonyms: blue fig |
| (noun) Australian tree with edible flesh and edible nutlike seed | Synonyms: Eucarya acuminata, Fusanus acuminatus, quandang, quandong tree |
| quango | (noun) a quasi nongovernmental organization; an organization that is financed by the government yet acts independently of the government | Synonyms: quasi-NGO |
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| quantic | (noun) a homogeneous polynomial having at least two variables | - |
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| quantifiability | (noun) the quality of being measurable | Synonyms: measurability |
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| quantification | (noun) the act of discovering or expressing the quantity of something | - |
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| (noun) a limitation imposed on the variables of a proposition (as by the quantifiers `some' or `all' or `no') | - |
| quantifier | (noun) (grammar) a word that expresses a quantity (as `fifteen' or `many') | - |
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| (noun) (logic) a word (such as `some' or `all' or `no') that binds the variables in a logical proposition | Synonyms: logical quantifier |
| quantisation | (noun) the act of dividing into quanta or expressing in terms of quantum theory | Synonyms: quantization |
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| quantity | (noun) how much there is or how many there are of something that you can quantify | Synonyms: amount, measure |
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| (noun) an adequate or large amount | - |
| (noun) the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable | - |
| quantization | (noun) the act of dividing into quanta or expressing in terms of quantum theory | Synonyms: quantisation |
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| quantong | (noun) red Australian fruit; used for dessert or in jam | Synonyms: native peach, quandang, quandong |
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| quantum | (noun) (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) | - |
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| (noun) a discrete amount of something that is analogous to the quantities in quantum theory | - |
| quarantine | (noun) isolation to prevent the spread of infectious disease | - |
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| (noun) enforced isolation of patients suffering from a contagious disease in order to prevent the spread of disease | - |
| quark | (noun) fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet | Synonyms: quark cheese |
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| (noun) (physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3 | - |
| quarrel | (noun) an arrow that is shot from a crossbow; has a head with four edges | - |
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| (noun) an angry dispute | Synonyms: dustup, row, run-in, words, wrangle |
| quarreler | (noun) a disputant who quarrels | Synonyms: quarreller |
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| quarreller | (noun) a disputant who quarrels | Synonyms: quarreler |
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| quarrelsomeness | (noun) an inclination to be quarrelsome and contentious | Synonyms: contentiousness |
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| quarrier | (noun) a man who works in a quarry | Synonyms: quarryman |
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| quarry | (noun) animal hunted or caught for food | Synonyms: prey |
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| (noun) a surface excavation for extracting stone or slate | Synonyms: pit, stone pit |
| (noun) a person who is the aim of an attack (especially a victim of ridicule or exploitation) by some hostile person or influence | Synonyms: fair game, prey, target |
| quarrying | (noun) the extraction of building stone or slate from an open surface quarry | - |
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| quarryman | (noun) a man who works in a quarry | Synonyms: quarrier |
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| quart | (noun) a United States liquid unit equal to 32 fluid ounces; four quarts equal one gallon | - |
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| (noun) a British imperial capacity measure (liquid or dry) equal to 2 pints or 1.136 liters | - |
| (noun) a United States dry unit equal to 2 pints or 67.2 cubic inches | Synonyms: dry quart |
| quartan | (noun) a malarial fever that recurs every fourth day | - |
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| quarter | (noun) clemency or mercy shown to a defeated opponent | - |
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| (noun) the rear part of a ship | Synonyms: after part, poop, stern, tail |
| (noun) piece of leather that comprises the part of a shoe or boot covering the heel and joining the vamp | - |
| (noun) a district of a city having some distinguishing character | - |
| (noun) an unspecified person | - |
| (noun) a United States or Canadian coin worth one fourth of a dollar | - |
| (noun) one of four equal parts | Synonyms: fourth, fourth part, one-fourth, one-quarter, quartern, twenty-five percent |
| (noun) a quarter of a hundredweight (25 pounds) | - |
| (noun) a quarter of a hundredweight (28 pounds) | - |
| (noun) one of the four major division of the compass | - |
| (noun) one of four periods into which the school year is divided | - |
| (noun) (football, professional basketball) one of four divisions into which some games are divided | - |
| (noun) a fourth part of a year; three months | - |
| (noun) a unit of time equal to 15 minutes or a quarter of an hour | - |
| quarterback | (noun) (American football) the position of the football player in the backfield who directs the offensive play of his team | Synonyms: field general, signal caller |
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| (noun) (football) the person who plays quarterback | Synonyms: field general, signal caller |
| quarterdeck | (noun) the stern area of a ship's upper deck | - |
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| quarterfinal | (noun) one of the four competitions in an elimination tournament whose winners go on to play in the semifinals | - |
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| quartering | (noun) dividing into four equal parts | - |
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| (noun) living accommodations (especially those assigned to military personnel) | - |
| (noun) a coat of arms that occupies one quarter of an escutcheon; combining four coats of arms on one shield usually represented intermarriages | - |
| quarterlight | (noun) car window consisting of a small pivoted glass vent in the door of a car | - |
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| quarterly | (noun) a periodical that is published every quarter (or four issues per year) | - |
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| quartermaster | (noun) an army officer who provides clothing and subsistence for troops | - |
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| quartern | (noun) one of four equal parts | Synonyms: fourth, fourth part, one-fourth, one-quarter, quarter, twenty-five percent |
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| quarters | (noun) housing available for people to live in | Synonyms: living quarters |
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| quarterstaff | (noun) a long stout staff used as a weapon | - |
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| quartervine | (noun) woody flowering vine of southern United States; stems show a cross in transverse section | Synonyms: Bignonia capreolata, cross vine, quarter-vine, trumpet flower |
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| quartet | (noun) a musical composition for four performers | Synonyms: quartette |
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| (noun) four people considered as a unit | Synonyms: foursome, quartette |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quadruplet, quartette |
| (noun) four performers or singers who perform together | Synonyms: quartette |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quatern, quaternary, quaternion, quaternity, tetrad |
| quartette | (noun) a musical composition for four performers | Synonyms: quartet |
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| (noun) four people considered as a unit | Synonyms: foursome, quartet |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quadruplet, quartet |
| (noun) four performers or singers who perform together | Synonyms: quartet |
| quartic | (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadrate, biquadratic, fourth power |
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| quartile | (noun) (statistics) any of three points that divide an ordered distribution into four parts each containing one quarter of the scores | - |
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| quarto | (noun) the size of a book whose pages are made by folding a sheet of paper twice to form four leaves | Synonyms: 4to |
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| quartz | (noun) a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities | - |
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| (noun) colorless glass made of almost pure silica | Synonyms: crystal, lechatelierite, quartz glass, vitreous silica |
| quartzite | (noun) hard metamorphic rock consisting essentially of interlocking quartz crystals | - |
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| quasar | (noun) a starlike object that may send out radio waves and other forms of energy; many have large red shifts | Synonyms: quasi-stellar radio source |
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| quasiparticle | (noun) a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle | - |
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| quassia | (noun) handsome South American shrub or small tree having bright scarlet flowers and yielding a valuable fine-grained yellowish wood; yields the bitter drug quassia from its wood and bark | Synonyms: bitterwood, Quassia amara |
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| (noun) a bitter compound used as an insecticide and tonic and vermifuge; extracted from the wood and bark of trees of the genera Quassia and Picrasma | - |
| quat | (noun) the leaves of the shrub Catha edulis which are chewed like tobacco or used to make tea; has the effect of a euphoric stimulant | Synonyms: African tea, Arabian tea, cat, kat, khat, qat |
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| quatercentenary | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentennial |
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| quatercentennial | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentenary |
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| quatern | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quaternary, quaternion, quaternity, tetrad |
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| quaternary | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternion, quaternity, tetrad |
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