| atrium | (noun) the central area in a building; open to the sky | - |
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| (noun) any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart) | - |
| atrocious | (adjective) provoking horror | Synonyms: frightful, horrible, horrifying, ugly |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, awful, dreadful, painful, terrible, unspeakable |
| (adjective) shockingly brutal or cruel | Synonyms: flagitious, grievous, monstrous |
| atrociously | (adverb) in a terrible manner | Synonyms: abominably, abysmally, awfully, rottenly, terribly |
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| (adverb) to an extravagant or immoderate degree | Synonyms: outrageously |
| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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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 |
| 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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| atrophic | (adjective) relating to or characterized by atrophy | - |
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| atrophied | (adjective) (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use | Synonyms: diminished, wasted |
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| 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 |
| (verb) undergo atrophy | - |
| atropine | (noun) a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides | - |
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| attract | (verb) direct toward itself or oneself by means of some psychological power or physical attributes | Synonyms: draw, draw in, pull, pull in |
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| (verb) exert a force on (a body) causing it to approach or prevent it from moving away | - |
| (verb) be attractive to | Synonyms: appeal |
| attractable | (adjective) capable of being magnetized or attracted by a magnet | - |
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| attracter | (noun) a characteristic that provides pleasure and attracts | Synonyms: attraction, attractive feature, attractor, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attractor |
| (noun) an entertainer who attracts large audiences | Synonyms: attraction, attractor, draw, drawing card |
| attraction | (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attractiveness |
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| (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attractive feature, attractor, magnet |
| (noun) an entertainment that is offered to the public | - |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attractor, draw, drawing card |
| (noun) the force by which one object attracts another | Synonyms: attractive force |
| attractive | (adjective) pleasing to the eye or mind especially through beauty or charm | - |
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| (adjective) having the properties of a magnet; the ability to draw or pull | - |
| (adjective) having power to arouse interest | - |
| attractively | (adverb) in a beautiful manner | Synonyms: beautifully |
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| attractiveness | (noun) sexual allure | - |
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| (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attraction |
| attractor | (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attraction, attractive feature, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attracter |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attraction, draw, drawing card |
| 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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| attrited | (adjective) worn by rubbing or friction | - |
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| attrition | (noun) the act of rubbing together; wearing something down by friction | - |
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| (noun) a wearing down to weaken or destroy | - |
| (noun) sorrow for sin arising from fear of damnation | Synonyms: contriteness, contrition |
| (noun) the wearing down of rock particles by friction due to water or wind or ice | Synonyms: abrasion, detrition, grinding |
| (noun) erosion by friction | Synonyms: abrasion, corrasion, detrition |
| attritional | (adjective) relating to or caused by attrition | - |
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| audiometric | (adjective) of or relating to audiometry | - |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| austral | (adjective) of the south or coming from the south | - |
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| (noun) the basic unit of money in Argentina; equal to 100 centavos | - |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| autostrada | (noun) an expressway in an Italian-speaking country | - |
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| autotroph | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophyte, autophytic plant, autotrophic organism |
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| autotrophic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autophytic |
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| aviatress | (noun) a woman aviator | Synonyms: airwoman, aviatrix |
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| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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| awestricken | (adjective) having or showing a feeling of mixed reverence and respect and wonder and dread | Synonyms: awed, awestruck |
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| awestruck | (adjective) having or showing a feeling of mixed reverence and respect and wonder and dread | Synonyms: awed, awestricken |
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| axletree | (noun) a dead axle on a carriage or wagon that has terminal spindles on which the wheels revolve | - |
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| aztreonam | (noun) an antibiotic (trade name Azactam) used against severe infections; has minimal side effects | Synonyms: Azactam |
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| bacitracin | (noun) a polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally | - |
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| backstroke | (noun) a swimming stroke that resembles the crawl except the swimmer lies on his or her back | - |
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| (verb) swim on one's back | - |
| backstroker | (noun) someone who swims the backstroke | - |
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| backtrack | (verb) retrace one's course | Synonyms: double back, turn back |
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| balustrade | (noun) a railing at the side of a staircase or balcony to prevent people from falling | Synonyms: balusters, banister, bannister, handrail |
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| banditry | (noun) the practice of plundering in gangs | - |
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| baptistry | (noun) bowl for baptismal water | Synonyms: baptismal font, baptistery, font |
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| bardolatry | (noun) the idolization of William Shakespeare | - |
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| barometric | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometrical |
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| barometrical | (adjective) relating to atmospheric pressure or indicated by a barometer | Synonyms: barometric |
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| 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 |
| basketry | (noun) the craft of basket making | - |
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| bathymetric | (adjective) of or relating to measurements of the depths of oceans or lakes | Synonyms: bathymetrical |
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| bathymetrical | (adjective) of or relating to measurements of the depths of oceans or lakes | Synonyms: bathymetric |
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| bathymetry | (noun) measuring the depths of the oceans | Synonyms: plumbing |
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| batrachian | (adjective) relating to frogs and toads | Synonyms: anuran, salientian |
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| (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: anuran, frog, salientian, toad, toad frog |
| batrachomyomachia | (noun) a silly altercation | - |
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| bedstraw | (noun) any of several plants of the genus Galium | - |
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| beetroot | (noun) round red root vegetable | Synonyms: beet |
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| (noun) beet having a massively swollen red root; widely grown for human consumption | Synonyms: Beta vulgaris rubra |
| belletristic | (adjective) written and regarded for aesthetic value rather than content | - |
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| benefactress | (noun) a woman benefactor | - |
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| bestrew | (verb) cover by strewing | - |
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| bestride | (verb) get up on the back of | Synonyms: climb on, get on, hop on, jump on, mount, mount up |
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| betatron | (noun) accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux | Synonyms: induction accelerator |
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| betray | (verb) give away information about somebody | Synonyms: denounce, give away, grass, rat, shit, shop, snitch, stag, tell on |
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| (verb) reveal unintentionally | Synonyms: bewray |
| (verb) cause someone to believe an untruth | Synonyms: deceive, lead astray |
| (verb) disappoint, prove undependable to; abandon, forsake | Synonyms: fail |
| (verb) deliver to an enemy by treachery | Synonyms: sell |
| (verb) be sexually unfaithful to one's partner in marriage | Synonyms: cheat, cheat on, cuckold, wander |
| betrayal | (noun) an act of deliberate betrayal | Synonyms: perfidy, treachery, treason |
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| (noun) the quality of aiding an enemy | - |
| betrayer | (noun) a person who says one thing and does another | Synonyms: double-crosser, double-dealer, traitor, two-timer |
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| (noun) one who reveals confidential information to the police or other authority | Synonyms: blabber, informer, rat, squealer |
| betroth | (verb) give to in marriage | Synonyms: affiance, engage, plight |
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| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| betrothed | (adjective) pledged to be married | Synonyms: bespoken, engaged |
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| (noun) the person to whom you are engaged | - |
| bevatron | (noun) a cyclotron that accelerates protons up to several billion electron volts | - |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibliolatry | (noun) the worship of the Bible | Synonyms: Bible-worship |
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| bicentric | (adjective) having two centers | - |
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| bigotry | (noun) the intolerance and prejudice of a bigot | - |
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| bimestrial | (adjective) two months long; lasting two months | - |
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| (adjective) occurring every two months | Synonyms: bimonthly |
| 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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| bioelectricity | (noun) electric phenomena in animals or plants | - |
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| biometrics | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometry, biostatistics |
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| biometry | (noun) a branch of biology that studies biological phenomena and observations by means of statistical analysis | Synonyms: biometrics, biostatistics |
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| bistre | (noun) a water-soluble brownish-yellow pigment made by boiling wood soot | Synonyms: bister |
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| bistred | (adjective) colored with or as if with bister | Synonyms: bistered |
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| bistro | (noun) a small informal restaurant; serves wine | - |
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| bistroic | (adjective) of or relating to or resembling a bistro | - |
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| bitartrate | (noun) an acid tartrate; a hydrogen tartrate | - |
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| bloodstream | (noun) the blood flowing through the circulatory system | Synonyms: blood stream |
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| bolometric | (adjective) of or relating to a bolometer | - |
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| bootstrap | (noun) a strap that is looped and sewn to the top of a boot for pulling it on | - |
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| (verb) help oneself, often through improvised means | - |
| botryoid | (adjective) resembling a cluster of grapes in form | Synonyms: botryoidal, boytrose |
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| botryoidal | (adjective) resembling a cluster of grapes in form | Synonyms: botryoid, boytrose |
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| bourtree | (noun) a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies | Synonyms: black elder, common elder, elderberry, European elder, Sambucus nigra |
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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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| boustrophedonic | (adjective) of or relating to writing alternate lines in opposite directions | - |
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| bowstring | (noun) the string of an archer's bow | - |
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| boytrose | (adjective) resembling a cluster of grapes in form | Synonyms: botryoid, botryoidal |
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| breaststroke | (noun) a swimming stroke; the arms are extended together in front of the head and swept back on either side accompanied by a frog kick | - |
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| (verb) swim with the face down and extend the arms forward and outward while kicking with the leg | - |
| breaststroker | (noun) someone who swims the breaststroke | - |
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| buttress | (noun) a support usually of stone or brick; supports the wall of a building | Synonyms: buttressing |
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| (verb) make stronger or defensible | - |
| (verb) reinforce with a buttress | - |
| buttressed | (adjective) held up by braces or buttresses | Synonyms: braced |
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