| alumbloom | (noun) any of several herbs of the genus Heuchera | Synonyms: alumroot |
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| bloat | (noun) swelling of the rumen or intestinal tract of domestic animals caused by excessive gas | - |
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| bloater | (noun) large fatty herring lightly salted and briefly smoked | - |
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| blob | (noun) an indistinct shapeless form | - |
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| bloc | (noun) a group of countries in special alliance | Synonyms: axis |
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| block | (noun) the act of obstructing or deflecting someone's movements | Synonyms: blocking |
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| (noun) a solid piece of something (usually having flat rectangular sides) | - |
| (noun) an obstruction in a pipe or tube | Synonyms: blockage, closure, occlusion, stop, stoppage |
| (noun) a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope | Synonyms: pulley-block, pulley, pulley block |
| (noun) a metal casting containing the cylinders and cooling ducts of an engine | Synonyms: cylinder block, engine block |
| (noun) a platform from which an auctioneer sells | Synonyms: auction block |
| (noun) housing in a large building that is divided into separate units | - |
| (noun) an inability to remember or think of something you normally can do; often caused by emotional tension | Synonyms: mental block |
| (noun) a number or quantity of related things dealt with as a unit | - |
| (noun) a rectangular area in a city surrounded by streets and usually containing several buildings | Synonyms: city block |
| (noun) (computer science) a sector or group of sectors that function as the smallest data unit permitted | - |
| (noun) a three-dimensional shape with six square or rectangular sides | Synonyms: cube |
| blockade | (noun) a war measure that isolates some area of importance to the enemy | Synonyms: encirclement |
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| (noun) prevents access or progress | - |
| blockage | (noun) the act of blocking | Synonyms: closure, occlusion |
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| (noun) an obstruction in a pipe or tube | Synonyms: block, closure, occlusion, stop, stoppage |
| (noun) the physical condition of blocking or filling a passage with an obstruction | Synonyms: obstruction |
| blockbuster | (noun) an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) | Synonyms: megahit, smash hit |
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| (noun) a large bomb used to demolish extensive areas (as a city block) | - |
| blocker | (noun) a class of drugs that inhibit (block) some biological process | Synonyms: blocking agent |
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| (noun) a football player whose responsibility is to block players attempting to stop an offensive play | - |
| blockhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| blockhouse | (noun) a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire | - |
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| blocking | (noun) the act of obstructing or deflecting someone's movements | Synonyms: block |
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| blog | (noun) a shared on-line journal where people can post diary entries about their personal experiences and hobbies | Synonyms: web log |
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| blogger | (noun) a person who keeps and updates a blog | - |
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| bloke | (noun) a boy or man | Synonyms: blighter, chap, cuss, fella, feller, fellow, gent, lad |
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| blolly | (noun) evergreen climbing shrub of southern Florida and West Indies grown for its racemes of fragrant white to creamy flowers followed by globose white succulent berries | Synonyms: Chiococca alba, West Indian snowberry |
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| blond | (noun) a light grayish yellow to near white | Synonyms: blonde |
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| (noun) a male person with fair skin and hair | - |
| blonde | (noun) a light grayish yellow to near white | Synonyms: blond |
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| (noun) a female person with fair skin and hair | - |
| blondness | (noun) the property of having a naturally light complexion | Synonyms: fairness, paleness |
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| blood | (noun) temperament or disposition | - |
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| (noun) the fluid (red in vertebrates) that is pumped through the body by the heart and contains plasma, blood cells, and platelets | - |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| (noun) people viewed as members of a group | - |
| (noun) a dissolute man in fashionable society | Synonyms: profligate, rake, rakehell, rip, roue |
| bloodbath | (noun) indiscriminate slaughter | Synonyms: battue, bloodletting, bloodshed |
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| bloodberry | (noun) bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas | Synonyms: blood berry, Rivina humilis, rouge plant, rougeberry |
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| bloodguilt | (noun) the state of being guilty of bloodshed and murder | - |
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| bloodhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: sleuthhound |
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| bloodiness | (noun) a disposition to shed blood | Synonyms: bloodthirstiness |
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| (noun) the state of being bloody | - |
| bloodleaf | (noun) any plant of the genus Iresine having colored foliage | - |
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| bloodletting | (noun) formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine) | - |
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| (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodshed |
| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| bloodlust | (noun) a desire for bloodshed | - |
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| bloodmobile | (noun) a motor vehicle equipped to collect blood donations | - |
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| bloodroot | (noun) perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant | Synonyms: puccoon, redroot, Sanguinaria canadensis, tetterwort |
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| bloodshed | (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodletting |
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| (noun) the shedding of blood resulting in murder | Synonyms: gore |
| bloodstain | (noun) a discoloration caused by blood | - |
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| bloodstock | (noun) thoroughbred horses (collectively) | - |
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| bloodstone | (noun) green chalcedony with red spots that resemble blood | Synonyms: heliotrope |
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| bloodstream | (noun) the blood flowing through the circulatory system | Synonyms: blood stream |
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| bloodsucker | (noun) carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end | Synonyms: hirudinean, leech |
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| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| bloodworm | (noun) a segmented marine worm with bright red body; often used for bait | - |
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| bloodwort | (noun) any of various plants of the family Haemodoraceae; roots contain a deep red coloring matter | - |
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| bloom | (noun) a powdery deposit on a surface | Synonyms: efflorescence |
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| (noun) reproductive organ of angiosperm plants especially one having showy or colorful parts | Synonyms: blossom, flower |
| (noun) the organic process of bearing flowers | Synonyms: blooming |
| (noun) a rosy color (especially in the cheeks) taken as a sign of good health | Synonyms: blush, flush, rosiness |
| (noun) the best time of youth | Synonyms: bloom of youth, salad days |
| (noun) the period of greatest prosperity or productivity | Synonyms: blossom, efflorescence, flower, flush, heyday, peak, prime |
| bloomer | (noun) an embarrassing mistake | Synonyms: blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| (noun) a flower that blooms in a particular way | - |
| bloomers | (noun) (used in the plural) underpants worn by women | Synonyms: drawers, knickers, pants |
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| blooming | (noun) the organic process of bearing flowers | Synonyms: bloom |
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| blooper | (noun) an embarrassing mistake | Synonyms: bloomer, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| blossom | (noun) reproductive organ of angiosperm plants especially one having showy or colorful parts | Synonyms: bloom, flower |
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| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, efflorescence, flower, flush, heyday, peak, prime |
| blossoming | (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, efflorescence, florescence, flowering, inflorescence |
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| blot | (noun) an act that brings discredit to the person who does it | Synonyms: smear, smirch, spot, stain |
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| (noun) a blemish made by dirt | Synonyms: daub, slur, smear, smirch, smudge, spot |
| blotch | (noun) an irregularly shaped spot | Synonyms: splodge, splotch |
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| blotter | (noun) the daily written record of events (as arrests) in a police station | Synonyms: charge sheet, day book, police blotter, rap sheet |
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| (noun) absorbent paper used to dry ink | Synonyms: blotting paper |
| blouse | (noun) a top worn by women | - |
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| blow | (noun) a powerful stroke with the fist or a weapon | - |
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| (noun) forceful exhalation through the nose or mouth | Synonyms: puff |
| (noun) street names for cocaine | Synonyms: C, coke, nose candy, snow |
| (noun) an impact (as from a collision) | Synonyms: bump |
| (noun) an unpleasant or disappointing surprise | Synonyms: shock |
| (noun) an unfortunate happening that hinders or impedes; something that is thwarting or frustrating | Synonyms: black eye, reversal, reverse, setback |
| (noun) a strong current of air | Synonyms: blast, gust |
| blowback | (noun) Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gases created by the ignition of the propellant charge. | - |
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| (noun) misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: backfire |
| blowball | (noun) any of several herbs of the genus Taraxacum having long tap roots and deeply notched leaves and bright yellow flowers followed by fluffy seed balls | Synonyms: dandelion |
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| blowbang | (noun) A sexual activity where fellatio is performed on multiple men | - |
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| blower | (noun) large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals | Synonyms: cetacean, cetacean mammal |
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| (noun) a device that produces a current of air | - |
| (noun) a fan run by an electric motor | Synonyms: electric fan |
| blowfish | (noun) any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers | Synonyms: globefish, puffer, pufferfish |
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| (noun) delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver | Synonyms: puffer, pufferfish, sea squab |
| blowfly | (noun) large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds | Synonyms: blow fly |
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| blowgun | (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowpipe, blowtube |
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| blowhard | (noun) a very boastful and talkative person | Synonyms: boaster, braggart, bragger, line-shooter, vaunter |
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| blowhole | (noun) a hole for the escape of gas or air | Synonyms: vent-hole, vent, venthole |
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| (noun) the spiracle of a cetacean located far back on the skull | - |
| blowing | (noun) processing that involves blowing a gas | - |
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| blowjob | (noun) slang for fellatio | Synonyms: cock sucking |
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| blowlamp | (noun) a burner that mixes air and gas to produce a very hot flame | Synonyms: blowtorch, torch |
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| blowout | (noun) a gay festivity | Synonyms: gala, gala affair, jamboree |
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| (noun) a sudden malfunction of a part or apparatus | - |
| (noun) an easy victory | Synonyms: laugher, romp, runaway, shoo-in, walkaway |
| blowpipe | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowtube |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowtube |
| blowtorch | (noun) a burner that mixes air and gas to produce a very hot flame | Synonyms: blowlamp, torch |
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| blowtube | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowpipe |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowpipe |
| blowup | (noun) a photographic print that has been enlarged | Synonyms: enlargement, magnification |
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| (noun) an unrestrained expression of emotion | Synonyms: ebullition, effusion, gush, outburst |
| (noun) a violent release of energy caused by a chemical or nuclear reaction | Synonyms: detonation, explosion |
| breechblock | (noun) a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing | Synonyms: breech closer |
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| cellblock | (noun) a division of a prison (usually consisting of several cells) | Synonyms: ward |
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| checkerbloom | (noun) perennial purple-flowered wild mallow of western North America that is also cultivated | Synonyms: Sidalcea malviflora, wild hollyhock |
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| counterblow | (noun) a return blow; a retaliatory blow | - |
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| deathblow | (noun) the blow that kills (usually mercifully) | Synonyms: coup de grace |
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| diablotin | (noun) a thin round slice of bread usually served with soup, especially consomme. | - |
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| doubloon | (noun) a former Spanish gold coin | - |
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| glassblower | (noun) someone skilled in blowing bottles from molten glass | - |
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| inkblot | (noun) a blot made with ink | - |
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| lifeblood | (noun) an essential or life-giving force | - |
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| (noun) the blood considered as the seat of vitality | - |
| loblolly | (noun) thick gruel | - |
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| microblog | (noun) a blog in which there is a limitation on the length of individual postings. | - |
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| oblong | (noun) a plane figure that deviates from a square or circle due to elongation | - |
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| oblongness | (noun) the property of being shaped like a rectangle | Synonyms: rectangularity |
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| obloquy | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, calumny, defamation, hatchet job, traducement |
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| (noun) state of disgrace resulting from public abuse | Synonyms: opprobrium |
| pueblo | (noun) a communal village built by Indians in the southwestern United States | - |
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| pureblood | (noun) a pedigreed animal of unmixed lineage; used especially of horses | Synonyms: purebred, thoroughbred |
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| roadblock | (noun) a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc. | Synonyms: barricade |
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| (noun) any condition that makes it difficult to make progress or to achieve an objective | Synonyms: barrier |
| shadblow | (noun) any of various North American trees or shrubs having showy white flowers and edible blue-black or purplish fruit | Synonyms: Juneberry, service tree, serviceberry, shadbush |
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| sunblock | (noun) a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn | Synonyms: sun blocker, sunscreen |
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| tabloid | (noun) newspaper with half-size pages | Synonyms: rag, sheet |
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| (noun) sensationalist journalism | Synonyms: tab, yellow journalism |
| temblor | (noun) shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity | Synonyms: earthquake, quake, seism |
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| whistleblower | (noun) an informant who exposes wrongdoing within an organization in the hope of stopping it | Synonyms: whistle-blower, whistle blower |
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