| quack | (adjective) medically unqualified | - |
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| (noun) the harsh sound of a duck | - |
| (noun) an untrained person who pretends to be a physician and who dispenses medical advice | - |
| (verb) act as a medical quack or a charlatan | - |
| (verb) utter quacking noises | - |
| 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 |
| quadrangular | (adjective) of or relating to or shaped like a quadrangle | - |
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| 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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| quadraphonic | (adjective) of or relating to quadraphony | Synonyms: quadrasonic, quadriphonic, quadrisonic |
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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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| quadrasonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadriphonic, quadrisonic |
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| quadrate | (adjective) having four sides and four angles | - |
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| (noun) a square-shaped object | - |
| (noun) a cubelike object | - |
| quadratic | (adjective) involving the second and no higher power of a quantity or degree | - |
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| (noun) a polynomial of the second degree | Synonyms: quadratic polynomial |
| (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 | (adjective) having four sides | Synonyms: four-sided |
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| (noun) a four-sided polygon | Synonyms: quadrangle, tetragon |
| 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 | (adjective) the ordinal number of one quadrillion in counting order | - |
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| (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
| quadripara | (noun) (obstetrics) woman who has given birth to a viable infant in each of four pregnancies | - |
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| quadripartite | (adjective) involving four parties | Synonyms: four-party |
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| quadriphonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadrisonic |
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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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| quadrisonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadriphonic |
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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 | (adjective) having four feet | Synonyms: four-footed, quadrupedal |
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| (noun) an animal especially a mammal having four limbs specialized for walking | - |
| quadrupedal | (adjective) having four feet | Synonyms: four-footed, quadruped |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| (noun) a quantity that is four times as great as another | - |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| (verb) increase fourfold | - |
| 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 |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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| (noun) any four copies; any of four things that correspond to one another exactly | - |
| (verb) reproduce fourfold | - |
| 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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| (verb) to swallow hurriedly or greedily or in one draught | Synonyms: gulp, swig |
| 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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| quaggy | (adjective) (of soil) soft and watery | Synonyms: boggy, marshy, miry, mucky, muddy, sloppy, sloughy, soggy, squashy, swampy, waterlogged |
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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 | - |
| (verb) draw back, as with fear or pain | Synonyms: cringe, flinch, funk, recoil, shrink, squinch, wince |
| quaint | (adjective) attractively old-fashioned (but not necessarily authentic) | Synonyms: old-time, olde worlde |
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| (adjective) strange in an interesting or pleasing way | - |
| (adjective) very strange or unusual; odd or even incongruous in character or appearance | - |
| quaintly | (adverb) in a quaint old-fashioned manner | - |
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| (adverb) in a strange but not unpleasant manner | - |
| 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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| (verb) shake with fast, tremulous movements | Synonyms: palpitate, quiver |
| (verb) shake with seismic vibrations | Synonyms: tremor |
| 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 |
| qualified | (adjective) meeting the proper standards and requirements and training for an office or position or task | - |
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| (adjective) limited or restricted; not absolute | - |
| (adjective) contingent on something else | Synonyms: dependant, dependent |
| (adjective) restricted in meaning; (as e.g. `man' in `a tall man') | Synonyms: restricted |
| (adjective) holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill | Synonyms: certified |
| 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 | - |
| qualify | (verb) make fit or prepared | Synonyms: dispose |
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| (verb) add a modifier to a constituent | Synonyms: modify |
| (verb) make more specific | - |
| (verb) specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement | Synonyms: condition, specify, stipulate |
| (verb) describe or portray the character or the qualities or peculiarities of | Synonyms: characterise, characterize |
| (verb) pronounce fit or able | - |
| (verb) prove capable or fit; meet requirements | Synonyms: measure up |
| 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 |
| qualitative | (adjective) involving distinctions based on qualities | - |
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| (adjective) relating to or involving comparisons based on qualities | - |
| qualitatively | (adverb) in a qualitative manner | - |
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| quality | (adjective) of superior grade | Synonyms: choice, prime, prize, select |
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| (adjective) of high social status | - |
| (noun) an essential and distinguishing attribute of something or someone | - |
| (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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| quantal | (adjective) of or relating to a quantum or capable of existing in only one of two states | Synonyms: quantized |
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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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| quantifiable | (adjective) capable of being quantified | - |
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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 |
| quantify | (verb) express as a number or measure or quantity | Synonyms: measure |
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| (verb) use as a quantifier | - |
| quantisation | (noun) the act of dividing into quanta or expressing in terms of quantum theory | Synonyms: quantization |
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| quantise | (verb) apply quantum theory to; restrict the number of possible values of (a quantity) or states of (a physical entity or system) so that certain variables can assume only certain discrete magnitudes that are integral multiples of a common factor | Synonyms: quantize |
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| (verb) approximate (a signal varying continuously in amplitude) by one whose amplitude is restricted to a prescribed set of discrete values | Synonyms: quantize |
| quantitative | (adjective) expressible as a quantity or relating to or susceptible of measurement | - |
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| (adjective) (of verse) having a metric system based on relative duration of syllables | - |
| (adjective) relating to the measurement of quantity | - |
| quantitatively | (adverb) in a quantitative manner | - |
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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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| quantize | (verb) apply quantum theory to; restrict the number of possible values of (a quantity) or states of (a physical entity or system) so that certain variables can assume only certain discrete magnitudes that are integral multiples of a common factor | Synonyms: quantise |
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| (verb) approximate (a signal varying continuously in amplitude) by one whose amplitude is restricted to a prescribed set of discrete values | Synonyms: quantise |
| quantized | (adjective) of or relating to a quantum or capable of existing in only one of two states | Synonyms: quantal |
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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 | - |
| (verb) place into enforced isolation, as for medical reasons | - |
| quarantined | (adjective) under forced isolation especially for health reasons | Synonyms: isolated |
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| 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 |
| (verb) have a disagreement over something | Synonyms: altercate, argufy, dispute, scrap |
| quarreler | (noun) a disputant who quarrels | Synonyms: quarreller |
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| quarreller | (noun) a disputant who quarrels | Synonyms: quarreler |
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| quarrelsome | (adjective) given to quarreling | - |
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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 |
| (verb) extract (something such as stones) from or as if from a quarry | - |
| 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 | (adjective) occurring every fourth day (especially the fever and weakness of malaria) | - |
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| (noun) a malarial fever that recurs every fourth day | - |
| 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 | - |
| (verb) divide by four; divide into quarters | - |
| (verb) divide into quarters | - |
| (verb) pull (a person) apart with four horses tied to his extremities, so as to execute him | Synonyms: draw, draw and quarter |
| (verb) provide housing for (military personnel) | Synonyms: billet, canton |
| 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 |
| (verb) play the quarterback | - |