| astutely | (adverb) in a shrewd manner | Synonyms: acutely, sagaciously, sapiently, shrewdly |
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| astuteness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: perspicaciousness, perspicacity, shrewdness |
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| (noun) the intellectual ability to penetrate deeply into ideas | Synonyms: deepness, depth, profoundness, profundity |
| astylar | (adjective) lacking columns or pillars | - |
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| asunder | (adjective) widely separated especially in space | - |
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| (adverb) into parts or pieces | Synonyms: apart |
| asylum | (noun) a hospital for mentally incompetent or unbalanced person | Synonyms: insane asylum, institution, mental home, mental hospital, mental institution, psychiatric hospital |
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| (noun) a shelter from danger or hardship | Synonyms: refuge, sanctuary |
| asymmetric | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetrical |
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| asymmetrical | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetric |
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| (adjective) irregular in shape or outline | Synonyms: crooked |
| asymmetrically | (adverb) in an asymmetrical manner | Synonyms: unsymmetrically |
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| asymmetry | (noun) (mathematics) a lack of symmetry | - |
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| asymptomatic | (adjective) having no symptoms of illness or disease | Synonyms: symptomless |
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| asymptote | (noun) a straight line that is the limiting value of a curve; can be considered as tangent at infinity | - |
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| asymptotic | (adjective) relating to or of the nature of an asymptote | - |
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| asymptotically | (adverb) toward an asymptote | - |
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| asynchronism | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchrony, desynchronisation, desynchronization, desynchronizing |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| asynchrony | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, desynchronisation, desynchronization, desynchronizing |
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| asynclitism | (noun) the presentation during labor of the head of the fetus at an abnormal angle | Synonyms: obliquity |
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| asyndetic | (adjective) lacking conjunctions | - |
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| asyndeton | (noun) the omission of conjunctions where they would normally be used | - |
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| asynergia | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergy |
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| asynergic | (adjective) of or relating to the state of asynergy; lacking synergy | - |
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| asynergy | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergia |
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| asystole | (noun) absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death | Synonyms: cardiac arrest, cardiopulmonary arrest |
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| atelectasis | (noun) collapse of an expanded lung (especially in infants); also failure of pulmonary alveoli to expand at birth | - |
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| atlas | (noun) a figure of a man used as a supporting column | Synonyms: telamon |
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| (noun) the 1st cervical vertebra | Synonyms: atlas vertebra |
| (noun) a collection of maps in book form | Synonyms: book of maps, map collection |
| atorvastatin | (noun) an oral drug (trade name Lipitor) that is effective in lowering triglycerides; potent in reducing LDL cholesterol because higher doses can be given | Synonyms: Lipitor |
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| audiocassette | (noun) a cassette for audiotape | - |
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| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| avascular | (adjective) without blood vessels | - |
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| awash | (adjective) covered with water | Synonyms: afloat, flooded, inundated, overflowing |
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| baas | (noun) South African term for `boss' | - |
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| babassu | (noun) tall feather palm of northern Brazil with hard-shelled nuts yielding valuable oil and a kind of vegetable ivory | Synonyms: babassu palm, coco de macao, Orbignya martiana, Orbignya phalerata, Orbignya spesiosa |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| backlash | (noun) an adverse reaction to some political or social occurrence | - |
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| (noun) a movement back from an impact | Synonyms: rebound, recoil, repercussion |
| (verb) come back to the originator of an action with an undesired effect | Synonyms: backfire, recoil |
| backwash | (noun) the wave that spreads behind a boat as it moves forward | Synonyms: wake |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: airstream, race, slipstream, wash |
| (noun) the consequences of an event (especially a catastrophic event) | Synonyms: aftermath, wake |
| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| badass | (adjective) being impressive due to extreme attitude or style | - |
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| (noun) A mean or belligerent person | - |
| (noun) A person considered impressive due to extreme attitudes, behavior or appearance | - |
| bagascosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagassosis |
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| bagasse | (noun) the dry dusty pulp that remains after juice is extracted from sugar cane or similar plants | - |
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| bagassosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagascosis |
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| balas | (noun) a pale rose-colored variety of the ruby spinel | Synonyms: balas ruby |
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| balderdash | (noun) trivial nonsense | Synonyms: fiddle-faddle, piffle |
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| ballast | (noun) any heavy material used to stabilize a ship or airship | - |
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| (noun) an electrical device for starting and regulating fluorescent and discharge lamps | Synonyms: light ballast |
| (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast resistor, barretter |
| (noun) an attribute that tends to give stability in character and morals; something that steadies the mind or feelings | - |
| (noun) coarse gravel laid to form a bed for streets and railroads | - |
| (verb) make steady with a ballast | - |
| bandmaster | (noun) the conductor of a band | - |
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| barbasco | (noun) West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood | Synonyms: Jacquinia keyensis, joewood |
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| basal | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: radical |
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| (adjective) serving as or forming a base | Synonyms: base |
| (adjective) of or being the essential or basic part | Synonyms: elemental, elementary, primary |
| basalt | (noun) the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene | - |
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| basaltic | (adjective) of or relating to or containing basalt | - |
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| bascule | (noun) a structure or device in which one end is counterbalanced by the other (on the principle of the seesaw) | - |
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| base | (adjective) serving as or forming a base | Synonyms: basal |
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| (adjective) debased; not genuine | - |
| (adjective) having or showing an ignoble lack of honor or morality | Synonyms: mean, meanspirited |
| (adjective) illegitimate | Synonyms: baseborn |
| (adjective) (used of metals) consisting of or alloyed with inferior metal | - |
| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: baseborn, humble, lowly |
| (adjective) not adhering to ethical or moral principles | Synonyms: immoral |
| (noun) a support or foundation | Synonyms: pedestal, stand |
| (noun) lowest support of a structure | Synonyms: foot, foundation, fundament, groundwork, substructure, understructure |
| (noun) a place that the runner must touch before scoring | Synonyms: bag |
| (noun) (electronics) the part of a transistor that separates the emitter from the collector | - |
| (noun) installation from which a military force initiates operations | Synonyms: base of operations |
| (noun) a flat bottom on which something is intended to sit | - |
| (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: infrastructure |
| (noun) the principal ingredient of a mixture | - |
| (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: basis, cornerstone, foundation, fundament, groundwork |
| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: radical, root, root word, stem, theme |
| (noun) a lower limit | Synonyms: floor |
| (noun) (anatomy) the part of an organ nearest its point of attachment | - |
| (noun) the place where you are stationed and from which missions start and end | Synonyms: home |
| (noun) the bottom or lowest part | - |
| (noun) (numeration system) the positive integer that is equivalent to one in the next higher counting place | Synonyms: radix |
| (noun) the most important or necessary part of something | Synonyms: basis |
| (noun) the bottom side of a geometric figure from which the altitude can be constructed | - |
| (noun) any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water | Synonyms: alkali |
| (noun) a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA) | Synonyms: nucleotide |
| (verb) use as a basis for; found on | Synonyms: establish, found, ground |
| (verb) use (purified cocaine) by burning it and inhaling the fumes | Synonyms: free-base |
| (verb) situate as a center of operations | - |
| baseball | (noun) a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs | Synonyms: ball, baseball game |
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| (noun) a ball used in playing baseball | - |
| baseboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: mopboard, skirting board |
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| baseborn | (adjective) illegitimate | Synonyms: base |
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| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: base, humble, lowly |
| based | (adjective) having a base of operations (often used as a combining form) | - |
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| (adjective) having a base | - |
| baseless | (adjective) without a basis in reason or fact | Synonyms: groundless, idle, unfounded, unwarranted, wild |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| basely | (adverb) in a despicable, ignoble manner | Synonyms: meanly, scurvily |
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| basement | (noun) the lowermost portion of a structure partly or wholly below ground level; often used for storage | Synonyms: cellar |
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| (noun) the ground floor facade or interior in Renaissance architecture | - |
| baseness | (noun) unworthiness by virtue of lacking higher values | Synonyms: contemptibility, despicability, despicableness, sordidness |
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| basenji | (noun) small smooth-haired breed of African origin having a tightly curled tail and the inability to bark | - |
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| bash | (noun) a vigorous blow | Synonyms: bang, belt, knock, smash |
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| (noun) an uproarious party | Synonyms: brawl, do |
| (verb) hit hard | Synonyms: bonk, bop, sock, whap, whop |
| bashful | (adjective) disposed to avoid notice | Synonyms: blate |
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| (adjective) self-consciously timid | - |
| bashfully | (adverb) in a shy or timid or bashful manner | Synonyms: shyly, timidly |
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| bashfulness | (noun) feeling embarrassed due to modesty | Synonyms: abashment |
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| basic | (adjective) pertaining to or constituting a base or basis | - |
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| (adjective) of or denoting or of the nature of or containing a base | - |
| (adjective) reduced to the simplest and most significant form possible without loss of generality | Synonyms: canonic, canonical |
| (adjective) serving as a base or starting point | Synonyms: introductory |
| (noun) (usually in the plural) a necessary commodity for which demand is constant | Synonyms: staple |
| basically | (adverb) in essence; at bottom or by one's (or its) very nature | Synonyms: essentially, fundamentally |
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| basics | (noun) principles from which other truths can be derived | Synonyms: basic principle, bedrock, fundamental principle, fundamentals |
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| (noun) a statement of fundamental facts or principles | Synonyms: rudiments |
| basidial | (adjective) relating to or characterized by basidia | - |
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| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| basidiomycete | (noun) any of various fungi of the subdivision Basidiomycota | Synonyms: basidiomycetous fungi |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiospore | (noun) a sexually produced fungal spore borne on a basidium | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| basidium | (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes | - |
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| basifixed | (adjective) attached by its base (as certain anthers to their filaments or stalks) | - |
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| basify | (verb) turn basic and less acidic | Synonyms: alkalify, alkalise, alkalize |
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| basil | (noun) leaves of the common basil; used fresh or dried | Synonyms: sweet basil |
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| (noun) any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum | - |
| basilar | (adjective) of or relating to or located at the base | Synonyms: basilary |
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| basilary | (adjective) of or relating to or located at the base | Synonyms: basilar |
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| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| basilican | (adjective) of or relating to or resembling a basilica | - |
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| basilisk | (noun) small crested arboreal lizard able to run on its hind legs; of tropical America | - |
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| (noun) ancient brass cannon | - |
| (noun) (classical mythology) a serpent (or lizard or dragon) able to kill with its breath or glance | - |
| basin | (noun) a bowl-shaped vessel; usually used for holding food or liquids | - |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: lavatory, washbasin, washbowl, washstand |
| (noun) the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet | Synonyms: catchment area, catchment basin, drainage area, drainage basin, river basin, watershed |
| (noun) a natural depression in the surface of the land often with a lake at the bottom of it | - |
| (noun) the quantity that a basin will hold | Synonyms: basinful |
| basinal | (adjective) of or relating to a basin | - |
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| basined | (adjective) enclosed in a basin | - |
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| basinet | (noun) a medieval steel helmet | - |
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| basinful | (noun) the quantity that a basin will hold | Synonyms: basin |
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| basipetal | (adjective) of leaves or flowers; developing or opening in succession from apex to base | - |
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| basis | (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: base, cornerstone, foundation, fundament, groundwork |
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| (noun) a relation that provides the foundation for something | Synonyms: footing, ground |
| (noun) the most important or necessary part of something | Synonyms: base |
| basiscopic | (adjective) facing or on the side toward the base | - |
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| bask | (verb) be exposed | - |
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| (verb) derive or receive pleasure from; get enjoyment from; take pleasure in | Synonyms: enjoy, relish, savor, savour |
| basket | (noun) a score in basketball made by throwing the ball through the hoop | Synonyms: field goal |
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| (noun) a container that is usually woven and has handles | Synonyms: handbasket |
| (noun) horizontal circular metal hoop supporting a net through which players try to throw the basketball | Synonyms: basketball hoop, hoop |
| (noun) the quantity contained in a basket | Synonyms: basketful |
| basketball | (noun) a game played on a court by two opposing teams of 5 players; points are scored by throwing the ball through an elevated horizontal hoop | Synonyms: basketball game, hoops |
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| (noun) an inflated ball used in playing basketball | - |
| basketeer | (noun) an athlete who plays basketball | Synonyms: basketball player, cager |
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| basketful | (noun) the quantity contained in a basket | Synonyms: basket |
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| basketmaker | (noun) someone skilled in weaving baskets | Synonyms: basketweaver |
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| basketry | (noun) the craft of basket making | - |
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