| antiferromagnetism | (noun) magnetic field creates parallel but opposing spins; varies with temperature | - |
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| antifertilizin | (noun) An immunologically specific substance produced by animal sperm to implement attraction by the egg before fertilization. | - |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| antifreeze | (noun) a liquid added to the water in a cooling system to lower its freezing point | - |
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| antifungal | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal agent, antimycotic, antimycotic agent, fungicide |
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| aperitif | (noun) alcoholic beverage taken before a meal as an appetizer | - |
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| aquifer | (noun) underground bed or layer yielding ground water for wells and springs etc | - |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| armful | (noun) the quantity that can be contained in the arms | - |
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| artefact | (noun) a man-made object taken as a whole | Synonyms: artifact |
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| artfulness | (noun) the quality of being adroit in taking unfair advantage | - |
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| artifact | (noun) a man-made object taken as a whole | Synonyms: artefact |
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| artifice | (noun) a deceptive maneuver (especially to avoid capture) | Synonyms: ruse |
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| artificer | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artisan, craftsman, journeyman |
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| (noun) someone who is the first to think of or make something | Synonyms: discoverer, inventor |
| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, armourer |
| artificialism | (noun) Czech surrealism founded in 1928 by Jindrich Styrsky and Toyen (Marie Cerminova). | - |
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| artificiality | (noun) the quality of being produced by people and not occurring naturally | - |
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| asafetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafoetida |
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| asafoetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafetida |
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| autofluorescence | (noun) self-induced fluorescence | - |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| autograft | (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autoplasty |
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| avifauna | (noun) the birds of a particular region or period | - |
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| awfulness | (noun) a quality of extreme unpleasantness | Synonyms: dreadfulness, horridness, terribleness |
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| backfield | (noun) the offensive football players who line up behind the linemen | - |
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| backfire | (noun) a miscalculation that recoils on its maker | Synonyms: boomerang |
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| (noun) a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: blowback |
| (noun) a fire that is set intentionally in order to slow an approaching forest fire or grassfire by clearing a burned area in its path | - |
| backflow | (noun) a flow that returns toward its source | Synonyms: backflowing |
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| backflowing | (noun) a flow that returns toward its source | Synonyms: backflow |
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| baffle | (noun) a flat plate that controls or directs the flow of fluid or energy | Synonyms: baffle board |
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| baffled | (noun) people who are frustrated and perplexed | - |
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| bafflement | (noun) confusion resulting from failure to understand | Synonyms: befuddlement, bemusement, bewilderment, mystification, obfuscation, puzzlement |
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| bagful | (noun) the quantity that a bag will hold | Synonyms: bag |
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| bailiff | (noun) an officer of the court who is employed to execute writs and processes and make arrests etc. | - |
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| bailiffship | (noun) the office of bailiff | - |
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| balefire | (noun) a large outdoor fire that is lighted as a signal or in celebration | Synonyms: bonfire |
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| balefulness | (noun) the quality or nature of being harmful or evil | Synonyms: maleficence, mischief |
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| balloonfish | (noun) similar to but smaller than porcupinefish | Synonyms: Diodon holocanthus |
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| barf | (noun) the matter ejected in vomiting | Synonyms: puke, vomit, vomitus |
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| barnful | (noun) the quantity that a barn will hold | - |
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| barrelfish | (noun) blackish fish of New England waters | Synonyms: black rudderfish, Hyperglyphe perciformis |
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| barrelful | (noun) the quantity that a barrel (of any size) will hold | Synonyms: barrel |
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| barrowful | (noun) the quantity that a barrow will hold | Synonyms: barrow |
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| bashfulness | (noun) feeling embarrassed due to modesty | Synonyms: abashment |
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| basinful | (noun) the quantity that a basin will hold | Synonyms: basin |
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| basketful | (noun) the quantity contained in a basket | Synonyms: basket |
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| batfish | (noun) bottom-dweller of warm western Atlantic coastal waters having a flattened scaleless body that crawls about on fleshy pectoral and pelvic fins | - |
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| battlefield | (noun) a region where a battle is being (or has been) fought | Synonyms: battleground, field, field of battle, field of honor |
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| battlefront | (noun) the line along which opposing armies face each other | Synonyms: front, front line |
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| beachfront | (noun) a strip of land running along a beach | - |
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| beanfeast | (noun) an annual dinner party given by an employer for the employees | - |
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| beatification | (noun) (Roman Catholic Church) an act of the Pope who declares that a deceased person lived a holy life and is worthy of public veneration; a first step toward canonization | - |
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| (noun) the action of rendering supremely blessed and extremely happy | - |
| (noun) a state of supreme happiness | Synonyms: beatitude, blessedness |
| beautification | (noun) the act of making something more beautiful | - |
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| bedfellow | (noun) a person with whom you share a bed | Synonyms: bedmate |
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| (noun) a temporary associate | - |
| bedframe | (noun) the framework of a bed | Synonyms: bedstead |
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| beef | (noun) cattle that are reared for their meat | Synonyms: beef cattle |
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| (noun) informal terms for objecting | Synonyms: bitch, gripe, kick, squawk |
| (noun) meat from an adult domestic bovine | Synonyms: boeuf |
| beefalo | (noun) hardy breed of cattle resulting from crossing domestic cattle with the American buffalo; yields leaner beef than conventional breeds | Synonyms: cattalo |
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| beefburger | (noun) a sandwich consisting of a fried cake of minced beef served on a bun, often with other ingredients | Synonyms: burger, hamburger |
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| beefcake | (noun) a photograph of a muscular man in minimal attire | - |
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| beefeater | (noun) officer in the (ceremonial) bodyguard of the British monarch | Synonyms: yeoman, yeoman of the guard |
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| beefsteak | (noun) a beef steak usually cooked by broiling | - |
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| beefwood | (noun) a tropical hardwood tree yielding balata gum and heavy red timber | Synonyms: balata, balata tree, bully tree, Manilkara bidentata |
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| (noun) any of several Australian trees of the genus Casuarina yielding heavy hard red wood used in cabinetwork | - |
| (noun) tree yielding hard heavy reddish wood | Synonyms: Grevillea striata |
| (noun) tree or tall shrub with shiny leaves and umbels of fragrant creamy-white flowers; yields hard heavy reddish wood | Synonyms: scrub beefwood, Stenocarpus salignus |
| (noun) any of several heavy hard reddish chiefly tropical woods of the families Casuarinaceae and Proteaceae; some used for cabinetwork | - |
| befooling | (noun) derision of someone or something as foolish or absurd or inconsistent | Synonyms: stultification |
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| befoulment | (noun) the state of being polluted | Synonyms: defilement, pollution |
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| befuddlement | (noun) confusion resulting from failure to understand | Synonyms: bafflement, bemusement, bewilderment, mystification, obfuscation, puzzlement |
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| behalf | (noun) as the agent of or on someone's part (usually expressed as `on behalf of' rather than `in behalf of') | - |
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| (noun) for someone's benefit (usually expressed as `in behalf' rather than `on behalf' and usually with a possessive) | - |
| belfry | (noun) a room (often at the top of a tower) where bells are hung | - |
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| (noun) a bell tower; usually stands alone unattached to a building | Synonyms: campanile |
| belief | (noun) any cognitive content held as true | - |
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| (noun) a vague idea in which some confidence is placed | Synonyms: feeling, impression, notion, opinion |
| bellflower | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: campanula |
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| bellyful | (noun) an undesirable overabundance | - |
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| benefaction | (noun) an act intending or showing kindness and good will | Synonyms: benevolence |
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| (noun) a contribution of money or assistance | - |
| benefactor | (noun) a person who helps people or institutions (especially with financial help) | Synonyms: helper |
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| benefactress | (noun) a woman benefactor | - |
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| benefice | (noun) an endowed church office giving income to its holder | Synonyms: ecclesiastical benefice |
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| beneficence | (noun) the quality of being kind or helpful or generous | - |
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| (noun) doing good; feeling beneficent | - |
| beneficiary | (noun) the semantic role of the intended recipient who benefits from the happening denoted by the verb in the clause | Synonyms: benefactive role |
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| (noun) the recipient of funds or other benefits | Synonyms: donee |
| beneficiation | (noun) crushing and separating ore into valuable substances or waste by any of a variety of techniques | Synonyms: mineral dressing, mineral extraction, mineral processing, ore dressing, ore processing |
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| benefit | (noun) something that aids or promotes well-being | Synonyms: welfare |
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| (noun) a performance to raise money for a charitable cause | - |
| (noun) financial assistance in time of need | - |
| benzofuran | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: coumarone, cumarone |
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| biff | (noun) (boxing) a blow with the fist | Synonyms: clout, lick, poke, punch, slug |
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| bifocals | (noun) (plural) eyeglasses having two focal lengths, one for near vision and the other for far vision | - |
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| bifurcation | (noun) the act of splitting into two branches | - |
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| (noun) the place where something divides into two branches | - |
| (noun) a bifurcating branch (one or both of them) | - |
| billfish | (noun) giant warm-water game fish having a prolonged and rounded toothless upper jaw | - |
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| (noun) elongate European surface-dwelling predacious fishes with long toothed jaws; abundant in coastal waters | Synonyms: gar, needlefish |
| (noun) primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth | Synonyms: gar, garfish, garpike, Lepisosteus osseus |
| (noun) slender long-beaked fish of temperate Atlantic waters | Synonyms: saury, Scomberesox saurus |
| billfold | (noun) a pocket-size case for holding papers and paper money | Synonyms: notecase, pocketbook, wallet |
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| binful | (noun) the quantity contained in a bin | Synonyms: bin |
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| biodefence | (noun) procedures involved in taking defensive measures against attacks using biological agents | Synonyms: biodefense, biological defence, biological defense |
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| biodefense | (noun) procedures involved in taking defensive measures against attacks using biological agents | Synonyms: biodefence, biological defence, biological defense |
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| biofeedback | (noun) a training program in which a person is given information about physiological processes (heart rate or blood pressure) that is not normally available with the goal of gaining conscious control of them | - |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| biosafety | (noun) safety from exposure to infectious agents | - |
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| birdfeeder | (noun) an outdoor device that supplies food for wild birds | Synonyms: bird feeder, feeder |
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| birefringence | (noun) splitting a ray into two parallel rays polarized perpendicularly | Synonyms: double refraction |
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| bisulfate | (noun) a salt or an ester of sulphuric acid with the chemical formula HSO4-. | Synonyms: hydrogen sulfate |
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| blackface | (noun) the makeup (usually burnt cork) used by a performer in order to imitate a Negro | - |
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| blackfish | (noun) female salmon that has recently spawned | - |
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| (noun) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school | Synonyms: black whale, common blackfish, Globicephala melaena, pilot whale |
| (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: tautog, Tautoga onitis |
| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| blastoff | (noun) the launching of a missile or spacecraft to a specified destination | Synonyms: shot |
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| blindfold | (noun) a cloth used to cover the eyes | - |
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| blissfulness | (noun) a state of extreme happiness | Synonyms: bliss, cloud nine, seventh heaven, walking on air |
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| bloodleaf | (noun) any plant of the genus Iresine having colored foliage | - |
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| 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 |