| archetype | (noun) something that serves as a model or a basis for making copies | Synonyms: original, pilot |
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| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| arrowhead | (noun) the pointed head or striking tip of an arrow | - |
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| ascolichen | (noun) a lichen in which the fungus component is an ascomycete | - |
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| asthenia | (noun) an abnormal loss of strength | Synonyms: astheny |
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| asthenopia | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: eyestrain |
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| asthenosphere | (noun) the lower layer of the crust | - |
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| astheny | (noun) an abnormal loss of strength | Synonyms: asthenia |
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| atheism | (noun) a lack of belief in the existence of God or gods | - |
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| atheist | (noun) someone who does not believe in the existence of a god | - |
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| athenaeum | (noun) a place where reading materials are available | Synonyms: atheneum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: atheneum |
| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| athetosis | (noun) a continuous succession of slow, writhing, involuntary movements of the hands and feet and other body parts | - |
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| atmosphere | (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, aura |
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| (noun) the mass of air surrounding the Earth | Synonyms: air |
| (noun) the envelope of gases surrounding any celestial body | - |
| (noun) a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade | Synonyms: atm, standard atmosphere, standard pressure |
| (noun) the weather or climate at some place | Synonyms: atmospheric state |
| (noun) a particular environment or surrounding influence | Synonyms: ambiance, ambience |
| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| atrophedema | (noun) recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs | Synonyms: angioedema, giant hives, periodic edema, Quincke's edema |
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| attache | (noun) a shallow and rectangular briefcase | Synonyms: attache case |
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| (noun) a specialist assigned to the staff of a diplomatic mission | - |
| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| autobiographer | (noun) someone who writes their own biography | - |
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| avalanche | (noun) a slide of large masses of snow and ice and mud down a mountain | - |
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| (noun) a sudden appearance of an overwhelming number of things | - |
| bachelor | (noun) a man who has never been married | Synonyms: unmarried man |
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| (noun) a knight of the lowest order; could display only a pennon | Synonyms: bachelor-at-arms, knight bachelor |
| bachelorette | (noun) a young unmarried woman who lives alone | Synonyms: bachelor girl |
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| bachelorhood | (noun) the state of being an unmarried man | - |
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| (noun) the time of a man's life prior to marriage | - |
| backache | (noun) an ache localized in the back | - |
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| backbencher | (noun) a member of the House of Commons who is not a party leader | - |
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| backscratcher | (noun) a long-handled scratcher for scratching your back | - |
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| (noun) someone who is willing to trade favors or services for mutual advantage | - |
| backsheesh | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: baksheesh, bakshis, bakshish, gratuity, pourboire, tip |
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| baksheesh | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: backsheesh, bakshis, bakshish, gratuity, pourboire, tip |
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| baldhead | (noun) a person whose head is bald or shaved | Synonyms: baldpate, baldy, skin, skinhead |
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| banshee | (noun) (Irish folklore) a female spirit who wails to warn of impending death | Synonyms: banshie |
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| barouche | (noun) a horse-drawn carriage having four wheels; has an outside seat for the driver and facing inside seats for two couples and a folding top | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| bathe | (noun) the act of swimming for pleasure or recreation | - |
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| bather | (noun) a person who travels through the water by swimming | Synonyms: natator, swimmer |
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| (noun) a person who takes a bath | - |
| bathyscaphe | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaph |
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| bathysphere | (noun) spherical deep diving apparatus (lowered by a cable) for underwater exploration | - |
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| beachhead | (noun) an initial accomplishment that opens the way for further developments | Synonyms: foothold |
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| (noun) a bridgehead on the enemy's shoreline seized by an amphibious operation | - |
| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| beheading | (noun) killing by cutting off the head | Synonyms: decapitation |
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| (noun) execution by cutting off the victim's head | Synonyms: decapitation |
| behemoth | (noun) someone that is abnormally large and powerful | Synonyms: colossus, giant, goliath, monster |
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| (noun) a person of exceptional importance and reputation | Synonyms: colossus, giant, heavyweight, titan |
| behest | (noun) an authoritative command or request | - |
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| bellwether | (noun) sheep that leads the herd often wearing a bell | - |
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| (noun) someone who assumes leadership of a movement or activity | - |
| bellyache | (noun) an ache localized in the stomach or abdominal region | Synonyms: gastralgia, stomach ache, stomachache |
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| bellyacher | (noun) a person given to excessive complaints and crying and whining | Synonyms: complainer, crybaby, grumbler, moaner, sniveller, squawker, whiner |
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| bethel | (noun) a house of worship (especially one for sailors) | - |
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| betrothed | (noun) the person to whom you are engaged | - |
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| bewitchery | (noun) magnetic personal charm | Synonyms: animal magnetism, beguilement |
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| bibliographer | (noun) someone trained in compiling bibliographies | - |
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| bibliothec | (noun) a professional person trained in library science and engaged in library services | Synonyms: librarian |
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| bibliotheca | (noun) a collection of books | - |
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| bighead | (noun) any of various diseases of animals characterized by edema of the head and neck | - |
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| bigheartedness | (noun) the quality of being kind and generous | - |
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| biochemist | (noun) someone with special training in biochemistry | - |
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| biochemistry | (noun) the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry | - |
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| biographer | (noun) someone who writes an account of a person's life | - |
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| biosphere | (noun) the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist | - |
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| biosynthesis | (noun) production of a chemical compound by a living organism | Synonyms: biogenesis |
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| bitchery | (noun) aggressive remarks and behavior like that of a spiteful malicious woman | - |
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| bitthead | (noun) the upper end of a bitt | - |
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| blackhead | (noun) a black-tipped plug clogging a pore of the skin | Synonyms: comedo |
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| blackheart | (noun) heart cherry with dark flesh and skin | Synonyms: blackheart cherry |
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| (noun) any of various diseases in which the central tissues blacken | - |
| blasphemer | (noun) a person who speaks disrespectfully of sacred things | - |
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| blasphemy | (noun) blasphemous behavior; the act of depriving something of its sacred character | Synonyms: desecration, profanation, sacrilege |
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| (noun) blasphemous language (expressing disrespect for God or for something sacred) | - |
| blastosphere | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastula |
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| blather | (noun) foolish gibberish | Synonyms: blatherskite |
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| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| bleacher | (noun) a worker who bleaches (cloth or flour etc.) | - |
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| bleachers | (noun) (used in the plural) an outdoor grandstand without a roof; patrons are exposed to the sun as linens are when they are bleached | - |
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| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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| blitheness | (noun) a feeling of spontaneous good spirits | Synonyms: cheerfulness |
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| 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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| bloodshed | (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodletting |
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| (noun) the shedding of blood resulting in murder | Synonyms: gore |
| blucher | (noun) a high shoe with laces over the tongue | - |
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| bluehead | (noun) small Atlantic wrasse the male of which has a brilliant blue head | Synonyms: Thalassoma bifasciatum |
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| blusher | (noun) makeup consisting of a pink or red powder applied to the cheeks | Synonyms: blush, paint, rouge |
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| (noun) yellowish edible agaric that usually turns red when touched | Synonyms: Amanita rubescens, blushing mushroom |
| bohemia | (noun) a group of artists and writers with real or pretended artistic or intellectual aspirations and usually an unconventional life style | - |
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| bohemian | (noun) a nonconformist writer or artist who lives an unconventional life | - |
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| bohemianism | (noun) conduct characteristic of a bohemian | - |
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| bombshell | (noun) an explosive bomb or artillery shell | - |
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| (noun) a shocking surprise | Synonyms: thunderbolt, thunderclap |
| (noun) an entertainer who has a sensational effect | - |
| bonehead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| bonheur | (noun) (French) happiness and good humor | - |
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| bonnethead | (noun) small harmless hammerhead having a spade-shaped head; abundant in bays and estuaries | Synonyms: bonnet shark, shovelhead, Sphyrna tiburo |
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| bookshelf | (noun) a shelf on which to keep books | - |
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| botcher | (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler |
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| bother | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, botheration, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) an angry disturbance | Synonyms: fuss, hassle, trouble |
| botheration | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, irritation, vexation |
| bouchee | (noun) shell of puff paste | Synonyms: patty shell |
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| boustrophedon | (noun) an ancient writing system: having alternate lines written in opposite directions; literally `as the ox ploughs' | - |
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| bowhead | (noun) large-mouthed Arctic whale | Synonyms: Balaena mysticetus, bowhead whale, Greenland whale |
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| breather | (noun) air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time | Synonyms: schnorchel, schnorkel, snorkel, snorkel breather |
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| (noun) a short respite | Synonyms: breath, breathing place, breathing space, breathing spell, breathing time |
| breeches | (noun) (used in the plural) trousers ending above the knee | Synonyms: knee breeches, knee pants, knickerbockers, knickers |
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| bridgehead | (noun) an area in hostile territory that has been captured and is held awaiting further troops and supplies | Synonyms: foothold |
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| (noun) a defensive post at the end of a bridge nearest to the enemy | - |
| brioche | (noun) a light roll rich with eggs and butter and somewhat sweet | - |
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