| bottleneck | (noun) the narrow part of a bottle near the top | - |
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| (noun) a narrowing that reduces the flow through a channel | Synonyms: chokepoint, constriction |
| bottomlessness | (noun) the property of being very deep; without limit | - |
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| bounciness | (noun) the quality of a substance that is able to rebound | Synonyms: bounce |
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| boundedness | (noun) the quality of being finite | Synonyms: finiteness, finitude |
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| boundlessness | (noun) the quality of being infinite; without bound or limit | Synonyms: infiniteness, infinitude, limitlessness, unboundedness |
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| bounteousness | (noun) (literary) generosity evidenced by a willingness to give freely | Synonyms: bounty |
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| bountifulness | (noun) the property of copious abundance | Synonyms: amplitude, bounty |
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| bourne | (noun) an archaic term for a goal or destination | Synonyms: bourn |
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| (noun) an archaic term for a boundary | Synonyms: bourn |
| bovine | (noun) any of various members of the genus Bos | - |
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| bowline | (noun) a loop knot that neither slips nor jams | Synonyms: bowline knot |
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| boyishness | (noun) being characteristic of a boy | - |
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| brachistochrone | (noun) a curve between two points along which a body can move under gravity in a shorter time than for any other curve. | - |
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| brackishness | (noun) the quality of being salty, as the saltiness of water | - |
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| brashness | (noun) the trait of being rash and hasty | - |
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| (noun) tasteless showiness | Synonyms: flashiness, garishness, gaudiness, glitz, loudness, meretriciousness, tawdriness |
| brattiness | (noun) The state or condition of acting like a brat, being unruly and impolite. | - |
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| braveness | (noun) a quality of spirit that enables you to face danger or pain without showing fear | Synonyms: bravery, courage, courageousness |
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| brawniness | (noun) possessing muscular strength | Synonyms: brawn, heftiness, muscle, muscularity, sinew |
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| brazenness | (noun) behavior marked by a bold defiance of the proprieties and lack of shame | Synonyms: shamelessness |
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| breadline | (noun) a queue of people waiting for free food | Synonyms: bread line |
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| breadwinner | (noun) one whose earnings are the primary source of support for their dependents | - |
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| breakableness | (noun) the consistency of something that breaks under pressure | - |
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| breakstone | (noun) any of various plants of the genus Saxifraga | Synonyms: rockfoil, saxifrage |
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| breastbone | (noun) the flat bone that articulates with the clavicles and the first seven pairs of ribs | Synonyms: sternum |
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| breathlessness | (noun) a dyspneic condition | Synonyms: shortness of breath, SOB |
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| breeziness | (noun) a breezy liveliness | Synonyms: jauntiness |
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| (noun) a mildly windy state of the air | Synonyms: windiness |
| briefness | (noun) the attribute of being brief or fleeting | Synonyms: brevity, transience |
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| (noun) the temporal property of being very short | - |
| brigandine | (noun) a medieval coat of chain mail consisting of metal rings sewn onto leather or cloth | - |
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| brigantine | (noun) two-masted sailing vessel square-rigged on the foremast and fore-and-aft rigged on the mainmast | Synonyms: hermaphrodite brig |
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| brightness | (noun) the location of a visual perception along a continuum from black to white | - |
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| (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness level, light, luminance, luminosity, luminousness |
| (noun) intelligence as manifested in being quick and witty | Synonyms: cleverness, smartness |
| brilliantine | (noun) a pomade to make the hair manageable and lustrous | - |
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| brimstone | (noun) an old name for sulfur | Synonyms: native sulfur, native sulphur |
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| brine | (noun) a strong solution of salt and water used for pickling | - |
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| (noun) water containing salts | Synonyms: saltwater, seawater |
| brininess | (noun) the relative proportion of salt in a solution | Synonyms: salinity |
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| briskness | (noun) liveliness and eagerness | Synonyms: alacrity, smartness |
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| bristliness | (noun) the quality of being covered with prickly thorns or spines | Synonyms: prickliness, spininess, thorniness |
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| brittleness | (noun) firm but easily broken | Synonyms: crispiness, crispness |
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| broadness | (noun) the property of being wide; having great width | Synonyms: wideness |
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| brokenheartedness | (noun) intense sorrow caused by loss of a loved one (especially by death) | Synonyms: grief, heartache, heartbreak |
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| bromine | (noun) a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water | Synonyms: atomic number 35, Br |
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| bronchopneumonia | (noun) pneumonia characterized by acute inflammation of the walls of the bronchioles | Synonyms: bronchial pneumonia |
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| brownness | (noun) an orange of low brightness and saturation | Synonyms: brown |
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| brownstone | (noun) a row house built of brownstone; reddish brown in color | - |
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| (noun) a reddish brown sandstone; used in buildings | - |
| brucine | (noun) a bitter alkaloid poison resembling strychnine and extracted from nux vomica | - |
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| brunet | (noun) a person with dark (brown) hair | Synonyms: brunette |
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| brunette | (noun) a person with dark (brown) hair | Synonyms: brunet |
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| brusqueness | (noun) an abrupt discourteous manner | Synonyms: abruptness, curtness, gruffness, shortness |
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| bubbliness | (noun) the property of giving off bubbles | Synonyms: effervescence, frothiness |
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| buccaneer | (noun) someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation | Synonyms: pirate, sea robber, sea rover |
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| buccaneering | (noun) hijacking on the high seas or in similar contexts; taking a ship or plane away from the control of those who are legally entitled to it | Synonyms: piracy |
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| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| buffoonery | (noun) acting like a clown or buffoon | Synonyms: clowning, frivolity, harlequinade, japery, prank |
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| bugbane | (noun) a plant of the genus Cimicifuga having flowers in long racemes or panicles reported to be distasteful to insects | - |
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| (noun) North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally | Synonyms: American hellebore, Indian poke, Veratrum viride, white hellebore |
| bugginess | (noun) the state of having bugs | - |
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| bulginess | (noun) the property possessed by a rounded convexity | Synonyms: roundedness |
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| bulkiness | (noun) an unwieldy largeness | Synonyms: massiveness |
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| bullheadedness | (noun) resolute adherence to your own ideas or desires | Synonyms: obstinacy, obstinance, pigheadedness, self-will, stubbornness |
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| bumpiness | (noun) the texture of a surface that has many bumps | - |
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| bumptiousness | (noun) offensive boldness and assertiveness | Synonyms: cockiness, forwardness, pushiness |
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| burdensomeness | (noun) unwelcome burdensome difficulty | Synonyms: heaviness, onerousness, oppressiveness |
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| burner | (noun) an apparatus for burning fuel (or refuse) | - |
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| (noun) the heating elements of a stove or range on which pots and pans are placed for cooking | - |
| business | (noun) the principal activity in your life that you do to earn money | Synonyms: job, line, line of work, occupation |
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| (noun) the activity of providing goods and services involving financial and commercial and industrial aspects | Synonyms: business enterprise, commercial enterprise |
| (noun) the volume of commercial activity | - |
| (noun) incidental activity performed by an actor for dramatic effect | Synonyms: byplay, stage business |
| (noun) an immediate objective | - |
| (noun) a rightful concern or responsibility | - |
| (noun) a commercial or industrial enterprise and the people who constitute it | Synonyms: business concern, business organisation, business organization, concern |
| (noun) customers collectively | Synonyms: clientele, patronage |
| (noun) business concerns collectively | Synonyms: business sector |
| businessman | (noun) a person engaged in commercial or industrial business (especially an owner or executive) | Synonyms: man of affairs |
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| businessmen | (noun) the body of individuals who manage businesses | Synonyms: business community |
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| businesspeople | (noun) people who transact business (especially business executives) | Synonyms: business people |
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| businessperson | (noun) a capitalist who engages in industrial commercial enterprise | Synonyms: bourgeois |
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| businesswoman | (noun) a female businessperson | - |
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| buspirone | (noun) a drug (trade name BuSpar) designed specifically for anxiety | Synonyms: BuSpar |
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| busyness | (noun) the state of being or appearing to be actively engaged in an activity | Synonyms: hum |
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| butacaine | (noun) a white crystalline ester that is applied to mucous membranes as a local anesthetic | Synonyms: butacaine sulfate |
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| butadiene | (noun) a gaseous hydrocarbon C4H6; used in making synthetic rubbers | - |
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| butane | (noun) occurs in natural gas; used in the manufacture of rubber and fuels | - |
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| butanone | (noun) colorless soluble flammable liquid ketone used as a solvent for resins and as a paint remover and in lacquers and cements and adhesives and cleaning fluids and celluloid | Synonyms: methyl ethyl ketone |
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| butene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butylene |
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| buteonine | (noun) any hawk of the genus Buteo | - |
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| butylene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butene |
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| buxomness | (noun) the bodily property of being attractively plump and vigorous and (of women) full-bosomed | - |
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| bygone | (noun) past events to be put aside | Synonyms: water under the bridge |
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| cabinet | (noun) a piece of furniture resembling a cupboard with doors and shelves and drawers; for storage or display | - |
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| (noun) housing for electronic instruments, as radio or television | Synonyms: console |
| (noun) a storage compartment for clothes and valuables; usually it has a lock | Synonyms: locker, storage locker |
| (noun) persons appointed by a head of state to head executive departments of government and act as official advisers | - |
| cabinetmaker | (noun) a woodworker who specializes in making furniture | Synonyms: furniture maker |
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| cabinetmaking | (noun) the craft of a joiner | Synonyms: joinery |
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| cabinetry | (noun) the craft of making furniture (especially furniture of high quality) | Synonyms: cabinetwork |
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| cabinetwork | (noun) the craft of making furniture (especially furniture of high quality) | Synonyms: cabinetry |
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| (noun) woodwork finished by hand by a cabinetmaker | - |
| cacogenesis | (noun) inability to produce hybrids that are both viable and fertile | - |
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| cadaverine | (noun) a colorless toxic ptomaine with an unpleasant odor formed during the putrefaction of animal tissue | - |
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| caenogenesis | (noun) introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) | Synonyms: cainogenesis, cenogenesis, kainogenesis, kenogenesis |
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| caffeine | (noun) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects | Synonyms: caffein |
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| cainogenesis | (noun) introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) | Synonyms: caenogenesis, cenogenesis, kainogenesis, kenogenesis |
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| calamine | (noun) a white mineral; a common ore of zinc | Synonyms: hemimorphite |
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| calcaneus | (noun) the largest tarsal bone; forms the human heel | Synonyms: heelbone, os tarsi fibulare |
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| calcimine | (noun) a water-base paint containing zinc oxide and glue and coloring; used as a wash for walls and ceilings | - |
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| callousness | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, hardness, insensibility, unfeelingness |
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| callowness | (noun) lacking and evidencing lack of experience of life | Synonyms: jejuneness, juvenility |
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| calmness | (noun) steadiness of mind under stress | Synonyms: calm, composure, equanimity |
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| (noun) a feeling of calm; an absence of agitation or excitement | - |
| (noun) an absence of strong winds or rain | - |
| campaigner | (noun) a politician who is running for public office | Synonyms: candidate, nominee |
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| canavanine | (noun) an amino acid found in the jack bean | - |
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| candidness | (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candor, candour, directness, forthrightness, frankness |
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| cane | (noun) a stiff switch, used to hit (usually students) as punishment | - |
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| (noun) a stick that people can lean on to help them walk | - |
| (noun) a strong slender often flexible stem as of bamboos, reeds, rattans, or sugar cane | - |
| canebrake | (noun) a dense growth of cane (especially giant cane) | - |
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| canecutter | (noun) a wood rabbit of southeastern United States swamps and lowlands | Synonyms: swamp hare, swamp rabbit, Sylvilagus aquaticus |
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| canella | (noun) highly aromatic inner bark of the Canella winterana used as a condiment and a tonic | Synonyms: canella bark, white cinnamon |
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