| actuary | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: statistician |
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| antiquarian | (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
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| antiquark | (noun) the antiparticle of a quark | - |
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| antiquary | (noun) an expert or collector of antiquities | Synonyms: antiquarian, archaist |
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| aquarium | (noun) a tank or pool or bowl filled with water for keeping live fish and underwater animals | Synonyms: fish tank, marine museum |
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| armguard | (noun) a protective covering for the wrist or arm that is used in archery and fencing and other sports | Synonyms: bracer |
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| blackguard | (noun) someone who is morally reprehensible | Synonyms: bounder, cad, dog, heel, hound |
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| bodyguard | (noun) a group of men who escort and protect some important person | - |
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| (noun) someone who escorts and protects a prominent person | Synonyms: escort |
| casuarina | (noun) any of various trees and shrubs of the genus Casuarina having jointed stems and whorls of scalelike leaves; some yield heavy hardwood | - |
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| coastguard | (noun) a military service responsible for the safety of maritime traffic in coastal waters | - |
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| coastguardsman | (noun) a member of a coastguard | - |
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| estuary | (noun) the wide part of a river where it nears the sea; fresh and salt water mix | - |
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| fireguard | (noun) a metal screen before an open fire for protection (especially against flying sparks) | Synonyms: fire screen |
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| (noun) a narrow field that has been cleared to check the spread of a prairie fire or forest fire | Synonyms: firebreak |
| forequarter | (noun) the front half of a side of meat | - |
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| foursquare | (noun) (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon | Synonyms: square |
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| guar | (noun) drought-tolerant herb grown for forage and for its seed which yield a gum used as a thickening agent or sizing material | Synonyms: cluster bean, Cyamopsis psoraloides, Cyamopsis tetragonolobus |
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| guarani | (noun) the basic unit of money in Paraguay; equal to 100 centimos | - |
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| guaranine | (noun) Guaranine is the name used to describe caffeine derived from the guarana plant. | - |
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| guarantee | (noun) a written assurance that some product or service will be provided or will meet certain specifications | Synonyms: warrant, warrantee, warranty |
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| (noun) an unconditional commitment that something will happen or that something is true | - |
| (noun) a collateral agreement to answer for the debt of another in case that person defaults | Synonyms: guaranty |
| guarantor | (noun) one who provides a warrant or guarantee to another | Synonyms: surety, warranter, warrantor |
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| guaranty | (noun) a collateral agreement to answer for the debt of another in case that person defaults | Synonyms: guarantee |
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| guard | (noun) a position on a basketball team | - |
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| (noun) the duty of serving as a sentry | Synonyms: guard duty, sentry duty, sentry go |
| (noun) (American football) a position on the line of scrimmage between the center and the tackles | - |
| (noun) a precautionary measure warding off impending danger or damage or injury etc. | Synonyms: precaution, safeguard |
| (noun) a device designed to prevent injury or accidents | Synonyms: safety, safety device |
| (noun) a posture of defence in boxing or fencing | - |
| (noun) a military unit serving to protect some place or person | - |
| (noun) the person who lines up between the center and the tackles on the offensive line of a football team on the line of scrimmage | - |
| (noun) a person who keeps watch over something or someone | - |
| (noun) the person who plays the position of guard on a basketball team | - |
| guardhouse | (noun) a military facility that serves as the headquarters for military police and in which military prisoners can be detained | - |
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| guardian | (noun) a person who cares for persons or property | Synonyms: defender, protector, shielder |
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| guardianship | (noun) the responsibility of a guardian or keeper | Synonyms: keeping, safekeeping |
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| (noun) attention and management implying responsibility for safety | Synonyms: care, charge, tutelage |
| guardrail | (noun) a railing placed alongside a stairway or road for safety | Synonyms: safety rail |
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| guardroom | (noun) a room used by soldiers on guard | - |
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| (noun) a cell in which soldiers who are prisoners are confined | - |
| guardsman | (noun) a soldier who is a member of a unit called `the guard' or `guards' | - |
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| headquarters | (noun) the military installation from which a commander performs the functions of command | Synonyms: HQ, military headquarters |
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| (noun) (usually plural) the office that serves as the administrative center of an enterprise | Synonyms: central office, home base, home office, main office |
| (noun) (plural) a military unit consisting of a commander and the headquarters staff | - |
| hindquarter | (noun) the back half of a side of meat | - |
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| hindquarters | (noun) the part of an animal that corresponds to the human buttocks | Synonyms: croup, croupe, rump |
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| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| huarache | (noun) a sandal with flat heels and an upper of woven leather straps | Synonyms: huaraches |
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| huaraches | (noun) a sandal with flat heels and an upper of woven leather straps | Synonyms: huarache |
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| jacquard | (noun) a highly figured fabric woven on a Jacquard loom | - |
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| jaguar | (noun) a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis | Synonyms: Felis onca, panther, Panthera onca |
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| jaguarondi | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: eyra, Felis yagouaroundi, jaguarundi, jaguarundi cat |
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| jaguarundi | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: eyra, Felis yagouaroundi, jaguarondi, jaguarundi cat |
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| lifeguard | (noun) an attendant employed at a beach or pool to protect swimmers from accidents | Synonyms: lifesaver |
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| mapinguari | (noun) supposed human-sized sloth-like creature reportedly sighted by Indians in the Amazon rain forest | - |
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| mortuary | (noun) a building (or room) where dead bodies are kept before burial or cremation | Synonyms: dead room, morgue |
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| mudguard | (noun) a curved piece above the wheel of a bicycle or motorcycle to protect the rider from water or mud thrown up by the wheels | Synonyms: splash-guard, splash guard |
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| obituary | (noun) a notice of someone's death; usually includes a short biography | Synonyms: necrology, obit |
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| ossuary | (noun) any receptacle for the burial of human bones | - |
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| 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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| rearguard | (noun) a detachment assigned to protect the rear of a (retreating) military body | - |
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| reliquary | (noun) a container where religious relics are stored or displayed (especially relics of saints) | - |
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| safeguard | (noun) a precautionary measure warding off impending danger or damage or injury etc. | Synonyms: guard, precaution |
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| (noun) a document or escort providing safe passage through a region especially in time of war | Synonyms: safe-conduct |
| saguaro | (noun) extremely large treelike cactus of desert regions of southwestern United States having a thick columnar sparsely branched trunk bearing white flowers and edible red pulpy fruit | Synonyms: Carnegiea gigantea, sahuaro |
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| sahuaro | (noun) extremely large treelike cactus of desert regions of southwestern United States having a thick columnar sparsely branched trunk bearing white flowers and edible red pulpy fruit | Synonyms: Carnegiea gigantea, saguaro |
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| sanctuary | (noun) area around the altar of a church for the clergy and choir; often enclosed by a lattice or railing | Synonyms: bema, chancel |
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| (noun) a shelter from danger or hardship | Synonyms: asylum, refuge |
| (noun) a consecrated place where sacred objects are kept | - |
| souari | (noun) large South American evergreen tree having trifoliate leaves and drupes with nutlike seeds used as food and a source of cooking oil | Synonyms: Caryocar nuciferum, souari nut, souari tree |
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| square | (noun) a hand tool consisting of two straight arms at right angles; used to construct or test right angles | - |
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| (noun) any artifact having a shape similar to a plane geometric figure with four equal sides and four right angles | - |
| (noun) an open area at the meeting of two or more streets | Synonyms: public square |
| (noun) a formal and conservative person with old-fashioned views | Synonyms: square toes |
| (noun) someone who doesn't understand what is going on | Synonyms: lame |
| (noun) the product of two equal terms | Synonyms: second power |
| (noun) (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon | Synonyms: foursquare |
| (noun) something approximating the shape of a square | - |
| squareness | (noun) the property of being shaped like a square | - |
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| squaretail | (noun) sluggish square-tailed fish armored with tough bony scales; of deep warm waters | - |
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| squark | (noun) a quark with an electric charge of -1/3 and a mass 988 times that of an electron and a strangeness of -1 | Synonyms: strange quark |
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| statuary | (noun) statues collectively | - |
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| usufructuary | (noun) someone who holds property by usufruct | - |
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| vanguard | (noun) the position of greatest importance or advancement; the leading position in any movement or field | Synonyms: cutting edge, forefront |
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| (noun) the leading units moving at the head of an army | Synonyms: van |
| (noun) any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts) | Synonyms: avant-garde, new wave, van |
| voluptuary | (noun) a person addicted to luxury and pleasures of the senses | Synonyms: sybarite |
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