| abulia | (noun) a loss of will power | Synonyms: aboulia |
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| abulic | (adjective) suffering from abulia; showing abnormal inability to act or make decisions | Synonyms: aboulic |
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| abundance | (noun) the property of a more than adequate quantity or supply | Synonyms: copiousness, teemingness |
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| (noun) (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million | - |
| (noun) (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present | - |
| abundant | (adjective) present in great quantity | - |
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| abundantly | (adverb) in an abundant manner | Synonyms: copiously, extravagantly, profusely |
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| abuse | (noun) improper or excessive use | Synonyms: misuse |
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| (noun) cruel or inhumane treatment | Synonyms: ill-treatment, ill-usage, maltreatment |
| (noun) a rude expression intended to offend or hurt | Synonyms: contumely, insult, revilement, vilification |
| (verb) change the inherent purpose or function of something | Synonyms: misuse, pervert |
| (verb) use wrongly or improperly or excessively | - |
| (verb) use foul or abusive language towards | Synonyms: blackguard, clapperclaw, shout |
| (verb) treat badly | Synonyms: ill-treat, ill-use, maltreat, mistreat, step |
| abused | (adjective) subjected to cruel treatment | Synonyms: ill-treated, maltreated, mistreated |
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| (adjective) used improperly or excessively especially drugs | - |
| abuser | (noun) someone who abuses | Synonyms: maltreater |
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| abusive | (adjective) characterized by physical or psychological maltreatment | - |
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| (adjective) expressing offensive reproach | Synonyms: opprobrious, scurrilous |
| abusively | (adverb) in an abusive manner | - |
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| abut | (verb) lie adjacent to another or share a boundary | Synonyms: adjoin, border, butt, butt against, butt on, edge, march |
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| abutment | (noun) a masonry support that touches and directly receives thrust or pressure of an arch or bridge | - |
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| (noun) point of contact between two objects or parts | - |
| abutter | (noun) the owner of contiguous property | - |
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| abuzz | (adjective) noisy like the sound of a bee | Synonyms: buzzing |
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| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| acetabular | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: cotyloid, cotyloidal |
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| acetabulum | (noun) the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint | Synonyms: cotyloid cavity |
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| afterburner | (noun) a device that injects fuel into a hot exhaust for extra thrust | - |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| airburst | (noun) an explosion in the atmosphere | - |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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| albuca | (noun) any of various plants of the genus Albuca having large clusters of pale yellow flowers; South Africa | - |
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| albuginea | (noun) whitish tunic | - |
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| album | (noun) a book of blank pages with pockets or envelopes; for organizing photographs or stamp collections etc | - |
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| (noun) one or more recordings issued together; originally released on 12-inch phonograph records (usually with attractive record covers) and later on cassette audiotape and compact disc | Synonyms: record album |
| albumen | (noun) the white part of an egg; the nutritive and protective gelatinous substance surrounding the yolk consisting mainly of albumin dissolved in water | Synonyms: egg white, ovalbumin, white |
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| (noun) a simple water-soluble protein found in many animal tissues and liquids | Synonyms: albumin |
| albumin | (noun) a simple water-soluble protein found in many animal tissues and liquids | Synonyms: albumen |
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| albuminoid | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: scleroprotein |
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| albuminous | (adjective) relating to or containing or resembling albumin | - |
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| albuminuria | (noun) the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder | Synonyms: proteinuria |
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| albuminuric | (adjective) of or related to the state of albuminuria | - |
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| albuterol | (noun) a bronchodilator (trade names Ventolin or Proventil) used for asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects are tachycardia and shakiness | Synonyms: Proventil, Ventolin |
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| ambulacral | (adjective) pertaining to the ambulacra of radial echinoderms | - |
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| ambulacrum | (noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located | - |
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| ambulance | (noun) a vehicle that takes people to and from hospitals | - |
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| ambulant | (adjective) able to walk about | Synonyms: ambulatory |
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| ambulate | (verb) walk about; not be bedridden or incapable of walking | - |
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| ambulation | (noun) walking about | - |
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| ambulatory | (adjective) relating to or adapted for walking | - |
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| (adjective) able to walk about | Synonyms: ambulant |
| (noun) a covered walkway (as in a cloister) | - |
| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| (verb) wait in hiding to attack | Synonyms: ambush, bushwhack, lie in wait, lurk, scupper, waylay |
| ambush | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambuscade, lying in wait, trap |
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| (verb) wait in hiding to attack | Synonyms: ambuscade, bushwhack, lie in wait, lurk, scupper, waylay |
| (verb) hunt (quarry) by stalking and ambushing | Synonyms: still-hunt |
| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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| analbuminemia | (noun) an abnormally low level of albumin in the blood serum | - |
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| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| attributable | (adjective) capable of being attributed | - |
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| attribute | (noun) an abstraction belonging to or characteristic of an entity | - |
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| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: dimension, property |
| (verb) attribute or credit to | Synonyms: ascribe, assign, impute |
| (verb) decide as to where something belongs in a scheme | Synonyms: assign |
| attribution | (noun) assigning to a cause or source | Synonyms: ascription |
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| (noun) assigning some quality or character to a person or thing | Synonyms: ascription |
| attributive | (adjective) of adjectives; placed before the nouns they modify | Synonyms: prenominal |
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| attributively | (adverb) in an attributive manner | - |
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| auburn | (adjective) (of hair) colored a moderate reddish-brown | - |
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| autobus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle |
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| babu | (noun) used as a Hindi courtesy title; equivalent to English `Mr' | Synonyms: baboo |
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| babushka | (noun) a woman's headscarf folded into a triangle and tied under the chin; worn by Russian peasant women | - |
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| barbu | (noun) found along western Atlantic coast | Synonyms: Polydactylus virginicus |
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| barnburner | (noun) an impressively successful event | - |
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| (noun) someone who burns down a barn | - |
| bedbug | (noun) bug of temperate regions that infests especially beds and feeds on human blood | Synonyms: bed bug, chinch, Cimex lectularius |
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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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| bellybutton | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, navel, omphalos, omphalus, umbilicus |
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| bibulous | (adjective) given to or marked by the consumption of alcohol | Synonyms: boozy, drunken, sottish |
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| blackbuck | (noun) common Indian antelope with a dark back and spiral horns | Synonyms: Antilope cervicapra, black buck |
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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) | - |
| blunderbuss | (noun) a short musket of wide bore with a flared muzzle | - |
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| boatbuilder | (noun) a person who builds boats | - |
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| bodybuilder | (noun) someone who does special exercises to develop a brawny musculature | Synonyms: muscle-builder, muscle builder, musclebuilder, muscleman |
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| bodybuilding | (noun) exercise that builds muscles through tension | Synonyms: anaerobic exercise, muscle building, musclebuilding |
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| brittlebush | (noun) fragrant rounded shrub of southwestern United States and adjacent Mexico having brittle stems and small crowded blue-green leaves and yellow flowers; produces a resin used in incense and varnish and in folk medicine | Synonyms: brittle bush, Encelia farinosa, incienso |
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| broncobuster | (noun) a person who breaks horses | Synonyms: bronco buster, buster |
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| bubaline | (adjective) relating to or resembling a buffalo | - |
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| bubble | (noun) a dome-shaped covering made of transparent glass or plastic | - |
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| (noun) an impracticable and illusory idea | - |
| (noun) a speculative scheme that depends on unstable factors that the planner cannot control | Synonyms: house of cards |
| (noun) a hollow globule of gas (e.g., air or carbon dioxide) | - |
| (verb) expel gas from the stomach | Synonyms: belch, burp, eruct |
| (verb) form, produce, or emit bubbles | - |
| (verb) cause to form bubbles | - |
| (verb) rise in bubbles or as if in bubbles | - |
| (verb) flow in an irregular current with a bubbling noise | Synonyms: babble, burble, guggle, gurgle, ripple |
| bubblejet | (noun) a kind of ink-jet printer | Synonyms: bubble-jet printer, bubble jet printer |
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| bubbler | (noun) a public fountain to provide a jet of drinking water | Synonyms: drinking fountain, water fountain |
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| (noun) any of various devices in which air or some other gas is bubbled through a liquid | - |
| bubbliness | (noun) the property of giving off bubbles | Synonyms: effervescence, frothiness |
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| bubbling | (adjective) emitting or filled with bubbles as from carbonation or fermentation | Synonyms: bubbly, effervescing, foaming, foamy, frothy, spumy |
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| (adjective) marked by high spirits or excitement | Synonyms: effervescent, frothy, scintillating, sparkly |
| bubbly | (adjective) emitting or filled with bubbles as from carbonation or fermentation | Synonyms: bubbling, effervescing, foaming, foamy, frothy, spumy |
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| (adjective) full of or showing high spirits | - |
| (noun) a white sparkling wine either produced in Champagne or resembling that produced there | Synonyms: champagne |
| bubo | (noun) a lymph node that is inflamed and swollen because of plague or gonorrhea or tuberculosis | - |
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| bubonic | (adjective) of or evidencing buboes | - |
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| buccal | (adjective) of or involving the mouth or mouth region or the surface on which the mouth is located | Synonyms: oral |
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| (adjective) of or relating to or toward the cheek | - |
| 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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| (verb) live like a buccaneer | - |
| 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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| buccula | (noun) a fold of fatty tissue under the chin | Synonyms: double chin |
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| buck | (noun) mature male of various mammals (especially deer or antelope) | - |
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| (noun) a framework for holding wood that is being sawed | Synonyms: horse, sawbuck, sawhorse |
| (noun) a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting | Synonyms: long horse, vaulting horse |
| (noun) a piece of paper money worth one dollar | Synonyms: clam, dollar, dollar bill, one dollar bill |
| (verb) jump vertically, with legs stiff and back arched | Synonyms: hitch, jerk |
| (verb) move quickly and violently | Synonyms: charge, shoot, shoot down, tear |
| (verb) resist | Synonyms: go against |
| (verb) to strive with determination | - |
| buckaroo | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckeroo, vaquero |
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| buckbean | (noun) perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at water margin and spreading across the surface | Synonyms: bog myrtle, bogbean, marsh trefoil, Menyanthes trifoliata, water shamrock |
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| buckboard | (noun) an open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles | - |
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| buckeroo | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckaroo, vaquero |
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| bucket | (noun) a roughly cylindrical vessel that is open at the top | Synonyms: pail |
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| (noun) the quantity contained in a bucket | Synonyms: bucketful |
| (verb) carry in a bucket | - |
| (verb) put into a bucket | - |
| bucketful | (noun) the quantity contained in a bucket | Synonyms: bucket |
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| buckeye | (noun) tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds | Synonyms: Aesculus hippocastanum, horse chestnut |
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| (noun) the inedible nutlike seed of the horse chestnut | Synonyms: conker, horse chestnut |
| buckle | (noun) fastener that fastens together two ends of a belt or strap; often has loose prong | - |
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| (noun) a shape distorted by twisting or folding | Synonyms: warp |
| (verb) bend out of shape, as under pressure or from heat | Synonyms: heave, warp |
| (verb) fasten with a buckle or buckles | Synonyms: clasp |
| (verb) fold or collapse | Synonyms: crumple |
| buckler | (noun) armor carried on the arm to intercept blows | Synonyms: shield |
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| buckleya | (noun) parasitic shrub of the eastern United States having opposite leaves and insignificant greenish flowers followed by oily dull green olivelike fruits | Synonyms: Buckleya distichophylla |
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| buckminsterfullerene | (noun) a spheroidal fullerene; the first known example of a fullerene | Synonyms: buckyball |
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| buckram | (adjective) rigidly formal | Synonyms: starchy, stiff |
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| (noun) a coarse cotton fabric stiffened with glue; used in bookbinding and to stiffen clothing | - |
| (verb) stiffen with or as with buckram | - |
| bucksaw | (noun) a saw that is set in a frame in the shape of an H; used with both hands to cut wood that is held in a sawbuck | - |
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| buckshee | (adjective) free of charge | - |
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| buckshot | (noun) small lead shot for shotgun shells | Synonyms: bird shot, duck shot |
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| buckskin | (noun) horse of a light yellowish dun color with dark mane and tail | - |
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| (noun) a soft yellowish suede leather originally from deerskin but now usually from sheepskin | - |
| buckskins | (noun) (used in the plural) breeches made of buckskin | - |
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| buckthorn | (noun) any shrub or small tree of the genus Bumelia | - |
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| (noun) a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments | - |
| (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ribwort, ripple-grass |