| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| aria | (noun) an elaborate song for solo voice | - |
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| arianist | (noun) an adherent of Arianism (the belief that Jesus Christ was not truly God) | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| arrhythmia | (noun) an abnormal rate of muscle contractions in the heart | Synonyms: cardiac arrhythmia |
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| artemisia | (noun) any of various composite shrubs or herbs of the genus Artemisia having aromatic green or greyish foliage | - |
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| arteria | (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arterial blood vessel, artery |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arthralgia | (noun) pain in a joint or joints | - |
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| 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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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| asphyxia | (noun) a condition in which insufficient or no oxygen and carbon dioxide are exchanged on a ventilatory basis; caused by choking or drowning or electric shock or poison gas | - |
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| asphyxiation | (noun) killing by depriving of oxygen | Synonyms: suffocation |
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| (noun) the condition of being deprived of oxygen (as by having breathing stopped) | Synonyms: suffocation |
| asphyxiator | (noun) a manually operated device for extinguishing small fires | Synonyms: extinguisher, fire extinguisher |
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| associability | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associableness |
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| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| associate | (noun) a degree granted by a two-year college on successful completion of the undergraduates course of studies | Synonyms: associate degree |
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| (noun) any event that usually accompanies or is closely connected with another | - |
| (noun) a person who joins with others in some activity or endeavor | - |
| (noun) a friend who is frequently in the company of another | Synonyms: companion, comrade, familiar, fellow |
| (noun) a person with subordinate membership in a society, institution, or commercial enterprise | - |
| associateship | (noun) the position of associate (as in an office or academy) | - |
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| association | (noun) the act of consorting with or joining with others | - |
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| (noun) the process of bringing ideas or events together in memory or imagination | Synonyms: connection, connexion |
| (noun) a formal organization of people or groups of people | - |
| (noun) (ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species | - |
| (noun) (chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding | - |
| (noun) a relation resulting from interaction or dependence | - |
| (noun) a social or business relationship | Synonyms: affiliation, tie-up, tie |
| (noun) the state of being connected together as in memory or imagination | - |
| associationism | (noun) (psychology) a theory that association is the basic principle of mental activity | Synonyms: association theory |
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| astasia | (noun) inability to stand due to muscular incoordination | - |
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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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| astigmia | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmatism |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmatism |
| astrantia | (noun) any plant of the genus Astrantia | Synonyms: masterwort |
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| astraphobia | (noun) a morbid fear of thunder and lightning | - |
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| astroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: macroglia |
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| asynergia | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergy |
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| ataraxia | (noun) peace of mind | - |
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| ataxia | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxy, dyssynergia, motor ataxia |
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| atonia | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonicity, atony |
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| atopognosia | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosis |
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| atresia | (noun) an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent | - |
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| authoritarian | (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
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| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| automysophobia | (noun) a morbid fear of being dirty | - |
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| auxiliary | (noun) someone who acts as assistant | Synonyms: aide |
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| avaritia | (noun) reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins) | Synonyms: avarice, covetousness, greed, rapacity |
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| aviary | (noun) a building where birds are kept | Synonyms: bird sanctuary, volary |
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| aviation | (noun) travel via aircraft | Synonyms: air, air travel |
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| (noun) the art of operating aircraft | Synonyms: airmanship |
| (noun) the aggregation of a country's military aircraft | Synonyms: air power |
| (noun) the operation of aircraft to provide transportation | - |
| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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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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| azotaemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotemia, uraemia, uremia |
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| azotemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, uraemia, uremia |
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| azoturia | (noun) excess of urea in the urine | - |
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| azymia | (noun) absence of an enzyme | - |
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| bacchanalia | (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, debauch, debauchery, drunken revelry, orgy, riot, saturnalia |
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| bacteremia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteriaemia, bacteriemia |
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| bacteria | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacterium |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bacteriaemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriemia |
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| bacteriemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriaemia |
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| balletomania | (noun) extraordinary enthusiasm for ballets | - |
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| banian | (noun) a loose fitting jacket; originally worn in India | Synonyms: banyan |
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| (noun) East Indian tree that puts out aerial shoots that grow down into the soil forming additional trunks | Synonyms: banian tree, banyan, banyan tree, East Indian fig tree, Ficus bengalensis, Indian banyan |
| banksia | (noun) any shrub or tree of the genus Banksia having alternate leathery leaves apetalous yellow flowers often in showy heads and conelike fruit with winged seeds | - |
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| barbarian | (noun) a member of an uncivilized people | Synonyms: savage |
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| (noun) a crude uncouth ill-bred person lacking culture or refinement | Synonyms: boor, churl, Goth, peasant, tike, tyke |
| bartonia | (noun) annual grown especially for its fragrant golden nocturnal flowers | Synonyms: Mentzelia lindleyi |
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| basophilia | (noun) the tendency of cells to stain with basic dyes | - |
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| batrachian | (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 |
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| batrachomyomachia | (noun) a silly altercation | - |
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| beautician | (noun) someone who works in a beauty parlor | Synonyms: cosmetician |
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| begonia | (noun) any of numerous plants of the genus Begonia grown for their attractive glossy asymmetrical leaves and colorful flowers in usually terminal cymes or racemes | - |
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| 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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| benzodiazepine | (noun) any of several similar lipophilic amines used as tranquilizers or sedatives or hypnotics or muscle relaxants; chronic use can lead to dependency | - |
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| bergenia | (noun) any plant of the genus Bergenia; valued as an evergreen ground cover and for the spring blossoms | - |
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| bestiality | (noun) sexual activity between a person and an animal | Synonyms: sodomy, zooerastia, zooerasty |
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| (noun) the stupid brutal quality of a beast | - |
| bestiary | (noun) a medieval book (usually illustrated) with allegorical and amusing descriptions of real and fabled animals | - |
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| bialy | (noun) flat crusty-bottomed onion roll | Synonyms: bialystoker |
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| bialystoker | (noun) flat crusty-bottomed onion roll | Synonyms: bialy |
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| bias | (noun) a partiality that prevents objective consideration of an issue or situation | Synonyms: preconception, prejudice |
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| (noun) a line or cut across a fabric that is not at right angles to a side of the fabric | Synonyms: diagonal |
| bibliomania | (noun) preoccupation with the acquisition and possession of books | - |
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| bicentennial | (noun) the 200th anniversary (or the celebration of it) | Synonyms: bicentenary |
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| biennial | (noun) (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season | - |
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| bignoniad | (noun) any woody plant of the family Bignoniaceae | - |
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| bilabial | (noun) a consonant that is articulated using both lips; /p/ or /b/ or /w/ | - |
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| bilharzia | (noun) an infestation with or a resulting infection caused by a parasite of the genus Schistosoma; common in the tropics and Far East; symptoms depend on the part of the body infected | Synonyms: bilharziasis, schistosomiasis |
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| bilharziasis | (noun) an infestation with or a resulting infection caused by a parasite of the genus Schistosoma; common in the tropics and Far East; symptoms depend on the part of the body infected | Synonyms: bilharzia, schistosomiasis |
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| billiards | (noun) any of several games played on rectangular cloth-covered table (with cushioned edges) in which long tapering cue sticks are used to propel ivory (or composition) balls | - |
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| binomial | (noun) (mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms | - |
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| bioremediation | (noun) the act of treating waste or pollutants by the use of microorganisms (as bacteria) that can break down the undesirable substances | - |
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| (noun) the branch of biotechnology that uses biological process to overcome environmental problems | - |
| biriani | (noun) an Indian dish made with highly seasoned rice and meat or fish or vegetables | Synonyms: biryani |
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| bletia | (noun) any of various orchids of the genus Bletia having pseudobulbs and erect leafless racemes of large purple or pink flowers | - |
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| bocconia | (noun) small Central American tree having loose racemes of purple-tinted green flowers | Synonyms: Bocconia frutescens, tree celandine |
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| (noun) herb of China and Japan widely cultivated for its plumelike panicles of creamy white flowers | Synonyms: Macleaya cordata, plume poppy |
| 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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| bolivia | (noun) a form of canasta in which sequences can be melded | - |
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| boliviano | (noun) the basic unit of money in Bolivia; equal to 100 centavos | - |
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| borrelia | (noun) cause of e.g. European and African relapsing fever | - |
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| brachiation | (noun) swinging by the arms from branch to branch | - |
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