| 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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| athodyd | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: atherodyde, flying drainpipe, ramjet, ramjet engine |
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| atonality | (noun) the absence of a key; alternative to the diatonic system | Synonyms: atonalism |
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| atonicity | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atony |
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| atony | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atonicity |
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| atopy | (noun) an allergic reaction that becomes apparent in a sensitized person only minutes after contact | Synonyms: atopic allergy, immediate allergy, type I allergic reaction |
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| atrocity | (noun) an act of atrocious cruelty | Synonyms: inhumanity |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, barbarity, barbarousness, heinousness |
| atrophy | (noun) any weakening or degeneration (especially through lack of use) | Synonyms: withering |
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| (noun) a decrease in size of an organ caused by disease or disuse | Synonyms: wasting, wasting away |
| attainability | (noun) the state of being achievable | Synonyms: achievability, attainableness |
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| attorney | (noun) a professional person authorized to practice law; conducts lawsuits or gives legal advice | Synonyms: lawyer |
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| attorneyship | (noun) the position of attorney | - |
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| atypicality | (noun) any state that is not typical | Synonyms: untypicality |
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| audacity | (noun) fearless daring | Synonyms: audaciousness, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audaciousness |
| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| augury | (noun) an event that is experienced as indicating important things to come | Synonyms: foretoken, preindication, sign |
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| aunty | (noun) the sister of your father or mother; the wife of your uncle | Synonyms: aunt, auntie |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| autarchy | (noun) a political system governed by a single individual | Synonyms: autocracy |
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| (noun) economic independence as a national policy | Synonyms: autarky |
| autarky | (noun) economic independence as a national policy | Synonyms: autarchy |
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| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| autobiography | (noun) a biography of yourself | - |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autochthony | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: endemism, indigenousness |
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| autocracy | (noun) a political theory favoring unlimited authority by a single individual | - |
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| (noun) a political system governed by a single individual | Synonyms: autarchy |
| autogamy | (noun) self-fertilization in plants | - |
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| autogeny | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogenesis, spontaneous generation |
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| autogyro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, gyroplane |
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| autoimmunity | (noun) production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions | - |
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| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| automysophobia | (noun) a morbid fear of being dirty | - |
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| autonomy | (noun) immunity from arbitrary exercise of authority: political independence | Synonyms: liberty |
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| (noun) personal independence | Synonyms: self-direction, self-reliance, self-sufficiency |
| autophyte | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophytic plant, autotroph, autotrophic organism |
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| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| autopsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: necropsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| autostereotype | (noun) the standardized mental picture held in common by members of a cultural group depicting an oversimplified image of themselves and their behaviour. | - |
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| autotomy | (noun) spontaneous removal or casting off of a body part (as the tail of a lizard or claw of a lobster) especially when the organism is injured or under attack | - |
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| autotype | (noun) an exact copy or reproduction | Synonyms: facsimile |
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| (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotypy |
| autotypy | (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotype |
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| auxiliary | (noun) someone who acts as assistant | Synonyms: aide |
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| availability | (noun) the quality of being at hand when needed | Synonyms: accessibility, availableness, handiness |
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| aviary | (noun) a building where birds are kept | Synonyms: bird sanctuary, volary |
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| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| awayness | (noun) the state of being elsewhere than in particular place | - |
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| axiology | (noun) the study of values and value judgments | - |
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| ayah | (noun) (in India) a native nursemaid who looks after children | - |
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| ayapana | (noun) low spreading tropical American shrub with long slender leaves used to make a mildly stimulating drink resembling tea; sometimes placed in genus Eupatorium | Synonyms: Ayapana triplinervis, Eupatorium aya-pana |
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| ayatollah | (noun) a high-ranking Shiite religious leader who is regarded as an authority on religious law and its interpretation and who has political power as well | - |
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| ayin | (noun) the 16th letter of the Hebrew alphabet | - |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| azymia | (noun) absence of an enzyme | - |
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| baby | (noun) a project of personal concern to someone | - |
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| (noun) a very young mammal | - |
| (noun) a very young child (birth to 1 year) who has not yet begun to walk or talk | Synonyms: babe, infant |
| (noun) the youngest member of a group (not necessarily young) | - |
| (noun) an immature childish person | Synonyms: child |
| (noun) an unborn child; a human fetus | - |
| (noun) a beloved person; used as terms of endearment | Synonyms: beloved, darling, dear, dearest, dearie, deary, honey, love, sweetheart, sweetie |
| babygram | (noun) an X-ray of the entire body of an infant. | - |
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| babyhood | (noun) the earliest state of immaturity | Synonyms: infancy |
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| (noun) the early stage of growth or development | Synonyms: early childhood, infancy |
| babyminder | (noun) a person who looks after babies (usually in the person's own home) while the babys' parents are working | Synonyms: baby minder, minder |
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| babysitter | (noun) a person engaged to care for children when the parents are not home | Synonyms: baby-sitter, sitter |
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| babysitting | (noun) the work of a baby sitter; caring for children when their parents are not home | Synonyms: baby sitting |
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| babytalk | (noun) the developing speech of a young child | Synonyms: baby talk |
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| (noun) an adult's imitation of the speech of a young child | Synonyms: baby talk, motherese |
| baccy | (noun) leaves of the tobacco plant dried and prepared for smoking or ingestion | Synonyms: tobacco |
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| backstay | (noun) a stay that supports the back of something | - |
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| backyard | (noun) the grounds in back of a house | - |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| baddeleyite | (noun) a mineral consisting of zirconium oxide | - |
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| bailey | (noun) the outer defensive wall that surrounds the outer courtyard of a castle | - |
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| (noun) the outer courtyard of a castle | - |
| bakery | (noun) a workplace where baked goods (breads and cakes and pastries) are produced or sold | Synonyms: bakehouse, bakeshop |
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| balcony | (noun) a platform projecting from the wall of a building and surrounded by a balustrade or railing or parapet | - |
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| (noun) an upper floor projecting from the rear over the main floor in an auditorium | - |
| baldy | (noun) a person whose head is bald or shaved | Synonyms: baldhead, baldpate, skin, skinhead |
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| ballplayer | (noun) an athlete who plays baseball | Synonyms: baseball player |
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| ballyhoo | (noun) blatant or sensational promotion | Synonyms: hoopla, hype, plug |
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| baloney | (noun) pretentious or silly talk or writing | Synonyms: bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| banality | (noun) a trite or obvious remark | Synonyms: bromide, cliche, commonplace, platitude |
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| banditry | (noun) the practice of plundering in gangs | - |
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| bandyleg | (noun) a leg bowed outward at the knee (or below the knee) | Synonyms: bandy leg, bow leg, bowleg, genu varum, tibia vara |
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| baneberry | (noun) a plant of the genus Actaea having acrid poisonous berries | Synonyms: cohosh, herb Christopher |
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| (noun) a poisonous berry of a plant of the genus Actaea | - |
| bankruptcy | (noun) a legal process intended to insure equality among the creditors of a corporation declared to be insolvent | - |
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| (noun) inability to discharge all your debts as they come due | Synonyms: failure |
| (noun) a state of complete lack of some abstract property | - |
| banyan | (noun) a loose fitting jacket; originally worn in India | Synonyms: banian |
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| (noun) East Indian tree that puts out aerial shoots that grow down into the soil forming additional trunks | Synonyms: banian, banian tree, banyan tree, East Indian fig tree, Ficus bengalensis, Indian banyan |
| baptistery | (noun) bowl for baptismal water | Synonyms: baptismal font, baptistry, font |
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| baptistry | (noun) bowl for baptismal water | Synonyms: baptismal font, baptistery, font |
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| barbarity | (noun) a brutal barbarous savage act | Synonyms: barbarism, brutality, savagery |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarousness, heinousness |
| barberry | (noun) any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries | - |
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| bardolatry | (noun) the idolization of William Shakespeare | - |
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| barley | (noun) a grain of barley | Synonyms: barleycorn |
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| (noun) cultivated since prehistoric times; grown for forage and grain | - |
| barleycorn | (noun) a grain of barley | Synonyms: barley |
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| (noun) a grain of barley | - |
| barnyard | (noun) a yard adjoining a barn | - |
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| baronetcy | (noun) the title of a baron | - |
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| (noun) the rank or dignity or position of a baronet or baroness | Synonyms: barony |
| barony | (noun) the domain of a baron | - |
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| (noun) the estate of a baron | - |
| (noun) the rank or dignity or position of a baronet or baroness | Synonyms: baronetcy |
| barratry | (noun) the offense of vexatiously persisting in inciting lawsuits and quarrels | - |
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| (noun) (maritime law) a fraudulent breach of duty by the master of a ship that injures the owner of the ship or its cargo; includes every breach of trust such as stealing or sinking or deserting the ship or embezzling the cargo | - |
| (noun) the crime of a judge whose judgment is influenced by bribery | - |
| (noun) traffic in ecclesiastical offices or preferments | Synonyms: simony |
| barycenter | (noun) (astronomy) the common center of mass around which two or more bodies revolve | - |
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| barye | (noun) the absolute unit of pressure equal to one dyne per square centimeter | Synonyms: bar absolute, microbar |
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| baryon | (noun) any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1 | Synonyms: heavy particle |
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| baryta | (noun) any of several compounds of barium | - |
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| barytes | (noun) a white or colorless mineral (BaSO4); the main source of barium | Synonyms: barite, barium sulphate, heavy spar |
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| barytone | (noun) a male singer | Synonyms: baritone |
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