| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| blighter | (noun) a persistently annoying person | Synonyms: cuss, gadfly, pest, pesterer |
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| (noun) a boy or man | Synonyms: bloke, chap, cuss, fella, feller, fellow, gent, lad |
| blister | (noun) (pathology) an elevation of the skin filled with serous fluid | Synonyms: bleb, bulla |
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| (noun) (botany) a swelling on a plant similar to that on the skin | - |
| (noun) a flaw on a surface resulting when an applied substance does not adhere (as an air bubble in a coat of paint) | - |
| blistering | (noun) the formation of vesicles in or beneath the skin | Synonyms: vesication, vesiculation |
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| bloater | (noun) large fatty herring lightly salted and briefly smoked | - |
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| 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) | - |
| 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 |
| bluestem | (noun) tall grass with smooth bluish leaf sheaths grown for hay in the United States | Synonyms: Andropogon furcatus, Andropogon gerardii, blue stem |
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| bluster | (noun) a swaggering show of courage | Synonyms: bravado |
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| (noun) vain and empty boasting | Synonyms: braggadocio, rhodomontade, rodomontade |
| (noun) a violent gusty wind | - |
| (noun) noisy confusion and turbulence | - |
| blusterer | (noun) a person who causes trouble by speaking indiscreetly | Synonyms: loudmouth |
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| boaster | (noun) a very boastful and talkative person | Synonyms: blowhard, braggart, bragger, line-shooter, vaunter |
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| boater | (noun) a stiff hat made of straw with a flat crown | Synonyms: leghorn, Panama, Panama hat, sailor, skimmer, straw hat |
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| (noun) someone who drives or rides in a boat | Synonyms: boatman, waterman |
| bobwhite | (noun) a popular North American game bird; named for its call | Synonyms: bobwhite quail, partridge |
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| boilerplate | (noun) thick plate iron used in the production of boilers | - |
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| (noun) standard formulations uniformly found in certain types of legal documents or news stories | - |
| boisterousness | (noun) the property of being noisy and lively and unrestrained | - |
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| (noun) a turbulent and stormy state of the sea | - |
| bolete | (noun) any fungus of the family Boletaceae | - |
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| bolometer | (noun) an instrument that measures heat radiation; extremely sensitive | - |
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| bolster | (noun) a pillow that is often put across a bed underneath the regular pillows | Synonyms: long pillow |
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| bonesetter | (noun) someone (not necessarily a licensed physician) who sets broken bones | - |
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| bookplate | (noun) a label identifying the owner of a book in which it is pasted | Synonyms: ex libris |
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| booster | (noun) an additional dose that makes sure the first dose was effective | Synonyms: booster dose, booster shot, recall dose |
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| (noun) the first stage of a multistage rocket | Synonyms: booster rocket, booster unit, takeoff booster, takeoff rocket |
| (noun) an amplifier for restoring the strength of a transmitted signal | Synonyms: booster amplifier, booster station, relay link, relay station, relay transmitter |
| (noun) a thief who steals goods that are in a store | Synonyms: lifter, shoplifter |
| (noun) someone who is an active supporter and advocate | Synonyms: plugger, promoter |
| (noun) a person who backs a politician or a team etc. | Synonyms: admirer, champion, friend, protagonist, supporter |
| bootee | (noun) a slipper that is soft and wool (for babies) | Synonyms: bootie |
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| borate | (noun) a salt or ester of boric acid | - |
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| bornite | (noun) a mineral consisting of sulfides of copper and iron that is found in copper deposits | Synonyms: peacock ore |
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| borosilicate | (noun) a salt of boric and silicic acids | - |
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| bounteousness | (noun) (literary) generosity evidenced by a willingness to give freely | Synonyms: bounty |
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| bracteole | (noun) a small bract | Synonyms: bractlet |
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| brainstem | (noun) the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus | Synonyms: brain-stem, brain stem |
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| breakwater | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: bulwark, groin, groyne, jetty, mole, seawall |
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| breastplate | (noun) armor plate that protects the chest; the front part of a cuirass | Synonyms: aegis, egis |
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| briquette | (noun) a block made from charcoal or coal dust and burned as fuel | Synonyms: briquet |
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| broadcaster | (noun) a mechanical device for scattering something (seed or fertilizer or sand etc.) in all directions | Synonyms: spreader |
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| (noun) someone who broadcasts on radio or television | - |
| brochette | (noun) a small spit or skewer | - |
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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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| bromate | (noun) a chemical compound that contains the bromate ion. | - |
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| broncobuster | (noun) a person who breaks horses | Synonyms: bronco buster, buster |
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| brunette | (noun) a person with dark (brown) hair | Synonyms: brunet |
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| brute | (noun) a living organism characterized by voluntary movement | Synonyms: animal, animate being, beast, creature, fauna |
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| (noun) a cruelly rapacious person | Synonyms: beast, savage, wildcat, wolf |
| bryophyte | (noun) any of numerous plants of the division Bryophyta | Synonyms: nonvascular plant |
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| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| bullfighter | (noun) someone who fights bulls | Synonyms: toreador |
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| bullterrier | (noun) a powerful short-haired terrier originated in England by crossing the bulldog with terriers | Synonyms: bull terrier |
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| bunkmate | (noun) someone who occupies the same sleeping quarters as yourself | - |
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| bunter | (noun) a batter who bunts | - |
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| burette | (noun) measuring instrument consisting of a graduated glass tube with a tap at the bottom; used for titration | Synonyms: buret |
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| burgomaster | (noun) a mayor of a municipality in Germany or Holland or Flanders or Austria | - |
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| burster | (noun) a quantity of explosive to be set off at one time | Synonyms: bursting charge, charge, explosive charge |
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| buster | (noun) a person (or thing) that breaks up or overpowers something | - |
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| (noun) a person who breaks horses | Synonyms: bronco buster, broncobuster |
| (noun) a robust child | - |
| (noun) an informal form of address for a man | Synonyms: dude, fellow |
| (noun) a person born in the generation following the baby boom when the birth rate fell dramatically | Synonyms: baby buster |
| 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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| butte | (noun) a hill that rises abruptly from the surrounding region; has a flat top and sloping sides | - |
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| butter | (noun) an edible emulsion of fat globules made by churning milk or cream; for cooking and table use | - |
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| (noun) a fighter who strikes the opponent with his head | - |
| butterball | (noun) small North American diving duck; males have bushy head plumage | Synonyms: Bucephela albeola, bufflehead, dipper |
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| (noun) a rotund individual | Synonyms: fat person, fatso, fatty, roly-poly |
| butterbean | (noun) small flat green bean similar to lima beans | Synonyms: butter bean, civet bean, sieva bean |
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| butterbur | (noun) small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas | Synonyms: bog rhubarb, Petasites hybridus, Petasites vulgaris |
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| buttercrunch | (noun) lettuce with delicate and relatively crunchy leaves | - |
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| buttercup | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, butterflower, crowfoot, goldcup, kingcup |
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| butterfat | (noun) the fatty substance of milk from which butter is made | - |
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| butterfingers | (noun) someone who drops things (especially one who cannot catch a ball) | - |
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| butterfish | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: stromateid, stromateid fish |
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| (noun) slippery scaleless food fish of the northern Atlantic coastal waters | Synonyms: Pholis gunnellus, rock gunnel |
| (noun) any of numerous small flat Atlantic food fish having smooth skin | - |
| butterflower | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, crowfoot, goldcup, kingcup |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| buttermilk | (noun) residue from making butter from sour raw milk; or pasteurized milk curdled by adding a culture | - |
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| butternut | (noun) oily egg-shaped nut of an American tree of the walnut family | - |
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| (noun) North American walnut tree having light-brown wood and edible nuts; source of a light-brown dye | Synonyms: butternut tree, Juglans cinerea, white walnut |
| butterscotch | (noun) a hard brittle candy made with butter and brown sugar | - |
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| butterweed | (noun) any of several yellow-flowered plants of the genus Packera; often placed in genus Senecio | - |
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| (noun) American ragwort with yellow flowers | Synonyms: ragwort, Senecio glabellus |
| butterwort | (noun) any of numerous carnivorous bog plants of the genus Pinguicula having showy purple or yellow or white flowers and a rosette of basal leaves coated with a sticky secretion to trap small insects | - |
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| buttery | (noun) a teashop where students in British universities can purchase light meals | - |
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| (noun) a small storeroom for storing foods or wines | Synonyms: larder, pantry |
| byte | (noun) a sequence of 8 bits (enough to represent one character of alphanumeric data) processed as a single unit of information | - |
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| cadaster | (noun) a public register showing the details of ownership and value of land; made for the purpose of taxation | Synonyms: cadastre |
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| cafeteria | (noun) a restaurant where you serve yourself and pay a cashier | - |
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| calcite | (noun) a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone | - |
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| caliphate | (noun) the office of a caliph | - |
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| (noun) the territorial jurisdiction of a caliph | - |
| calorimeter | (noun) a measuring instrument that determines quantities of heat | - |
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| calypter | (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: alula |
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| campmate | (noun) someone who lives in the same camp you do | - |
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| campsite | (noun) a site where people on holiday can pitch a tent | Synonyms: bivouac, campground, camping area, camping ground, camping site, encampment |
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| candidate | (noun) someone who is considered for something (for an office or prize or honor etc.) | Synonyms: prospect |
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| (noun) a politician who is running for public office | Synonyms: campaigner, nominee |
| canecutter | (noun) a wood rabbit of southeastern United States swamps and lowlands | Synonyms: swamp hare, swamp rabbit, Sylvilagus aquaticus |
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| canistel | (noun) ovoid orange-yellow mealy sweet fruit of Florida and West Indies | Synonyms: eggfruit |
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| (noun) tropical tree of Florida and West Indies yielding edible fruit | Synonyms: canistel tree, Pouteria campechiana nervosa |
| canister | (noun) metal container for storing dry foods such as tea or flour | Synonyms: cannister, tin |
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| (noun) a metallic cylinder packed with shot and used as ammunition in a firearm | Synonyms: canister shot, case shot |
| cannister | (noun) metal container for storing dry foods such as tea or flour | Synonyms: canister, tin |
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| canteen | (noun) a flask for carrying water; used by soldiers or travelers | - |
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| (noun) restaurant in a factory; where workers can eat | - |
| (noun) a recreation room in an institution | - |
| (noun) a restaurant outside; often for soldiers or policemen | Synonyms: mobile canteen |
| (noun) sells food and personal items to personnel at an institution or school or camp etc. | - |
| canter | (noun) a smooth three-beat gait; between a trot and a gallop | Synonyms: lope |
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| capitate | (noun) the wrist bone with a rounded head shape that articulates with the 3rd metacarpus | Synonyms: capitate bone, os capitatum |
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| capote | (noun) a long cloak with a hood that can be pulled over the head | Synonyms: hooded cloak |
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| (noun) a long overcoat with a hood that can be pulled over the head | Synonyms: hooded coat |
| carbamate | (noun) a salt (or ester) of carbamic acid | - |
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| carbohydrate | (noun) an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain | Synonyms: saccharide, sugar |
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| carbonate | (noun) a salt or ester of carbonic acid (containing the anion CO3) | - |
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| cardinalate | (noun) the office of cardinal | Synonyms: cardinalship |
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| (noun) (Roman Catholic Church) the body of all cardinals of the church; elects and advises the pope | Synonyms: College of Cardinals, Sacred College, Sacred College of Cardinals |
| carinate | (noun) birds having keeled breastbones for attachment of flight muscles | Synonyms: carinate bird, flying bird |
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| carnallite | (noun) a white or reddish mineral consisting of hydrous chlorides of potassium and magnesium; used as a fertilizer and as a source of potassium and magnesium | - |
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| carnotite | (noun) a yellow radioactive mineral; an ore of uranium and radium and vanadium | - |
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| carotene | (noun) an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver | Synonyms: carotin, provitamin A |
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| (noun) yellow or orange-red fat-soluble pigments in plants | - |
| carotenemia | (noun) excess carotene in the blood stream; can cause the skin to turn a pale yellow or red color | Synonyms: xanthemia |
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| carotenoid | (noun) any of a class of highly unsaturated yellow to red pigments occurring in plants and animals | - |
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| carpenter | (noun) a woodworker who makes or repairs wooden objects | - |
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| carpenteria | (noun) California evergreen shrub having glossy opposite leaves and terminal clusters of a few fragrant white flowers | Synonyms: Carpenteria californica |
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| carte | (noun) a list of dishes available at a restaurant | Synonyms: bill of fare, card, carte du jour, menu |
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