| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| artesian | (adjective) (of water) rising to the surface under internal hydrostatic pressure | - |
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| arthrocentesis | (noun) removal of fluid from a joint by centesis | - |
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| arthrodesis | (noun) the surgical fixation of a joint which is intended to result in bone fusion | - |
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| asbestosis | (noun) lung disease caused by inhaling asbestos particles | - |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascension | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascent, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascent, rise, rising |
| (noun) (astronomy) the rising of a star above the horizon | - |
| ascensional | (adjective) tending to rise | - |
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| ascensive | (adjective) tending or directed upward | Synonyms: ascendant, ascendent |
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| ascesis | (noun) rigorous self-denial and active self-restraint | Synonyms: asceticism |
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| asepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: antisepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: antisepsis, sterileness, sterility |
| aside | (noun) a line spoken by an actor to the audience but not intended for others on the stage | - |
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| (noun) a message that departs from the main subject | Synonyms: digression, divagation, excursus, parenthesis |
| (adverb) on or to one side | - |
| (adverb) out of the way (especially away from one's thoughts) | Synonyms: away |
| (adverb) in reserve; not for immediate use | Synonyms: away, by |
| (adverb) not taken into account or excluded from consideration | Synonyms: apart |
| (adverb) placed or kept separate and distinct as for a purpose | Synonyms: apart |
| (adverb) in a different direction | Synonyms: away |
| asinine | (adjective) extremely silly or stupid | Synonyms: fatuous, inane |
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| asininity | (noun) the quality of being asinine; stupidity combined with stubbornness | - |
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| aspergillosis | (noun) an opportunistic infection by a fungus of the genus Aspergillus; characterized by inflammation and lesions of the ear and other organs | - |
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| (noun) disease especially in agricultural workers caused by inhalation of Aspergillus spores causing lumps in skin and ears and respiratory organs | - |
| (noun) severe respiratory disease of birds that takes the form of an acute rapidly fatal pneumonia in young chickens and turkeys | Synonyms: brooder pneumonia |
| aspersion | (noun) an abusive attack on a person's character or good name | Synonyms: calumny, defamation, denigration, slander |
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| (noun) the act of sprinkling water in baptism (rare) | Synonyms: sprinkling |
| (noun) a disparaging remark | Synonyms: slur |
| assassin | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassinator, bravo |
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| (noun) a member of a secret order of Muslims (founded in the 12th century) who terrorized and killed Christian Crusaders | - |
| assassinate | (verb) destroy or damage seriously, as of someone's reputation | - |
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| (verb) murder; especially of socially prominent persons | - |
| assassinated | (adjective) murdered by surprise attack for political reasons | - |
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| assassination | (noun) murder of a public figure by surprise attack | - |
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| (noun) an attack intended to ruin someone's reputation | Synonyms: blackwash, character assassination |
| assassinator | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassin, bravo |
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| assibilate | (verb) change into a sibilant | - |
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| (verb) insert a sibilant sound before or after (another sound) | - |
| assibilation | (noun) pronunciation with a sibilant (hissing or whistling) sound | Synonyms: sibilation |
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| (noun) the development of a consonant phoneme into a sibilant | - |
| assiduity | (noun) great and constant diligence and attention | Synonyms: assiduousness, concentration |
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| assiduous | (adjective) marked by care and persistent effort | Synonyms: sedulous |
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| assiduously | (adverb) with care and persistence | - |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| assign | (verb) select something or someone for a specific purpose | Synonyms: set apart, specify |
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| (verb) attribute or credit to | Synonyms: ascribe, attribute, impute |
| (verb) decide as to where something belongs in a scheme | Synonyms: attribute |
| (verb) attribute or give | Synonyms: put |
| (verb) transfer one's right to | - |
| (verb) give out | Synonyms: allot, portion |
| (verb) make undue claims to having | Synonyms: arrogate |
| (verb) give an assignment to (a person) to a post, or assign a task to (a person) | Synonyms: delegate, depute, designate |
| assignable | (adjective) legally transferable to the ownership of another | Synonyms: conveyable, negotiable, transferable, transferrable |
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| assignation | (noun) a secret rendezvous (especially between lovers) | Synonyms: tryst |
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| (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportioning, apportionment, parceling, parcelling |
| assigned | (adjective) appointed to a post or duty | - |
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| assignee | (noun) (law) the party to whom something is assigned (e.g., someone to whom a right or property is legally transferred) | - |
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| assigning | (noun) the act of distributing something to designated places or persons | Synonyms: assignment |
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| assignment | (noun) a duty that you are assigned to perform (especially in the armed forces) | Synonyms: duty assignment |
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| (noun) the act of putting a person into a non-elective position | Synonyms: appointment, designation, naming |
| (noun) the act of distributing something to designated places or persons | Synonyms: assigning |
| (noun) an undertaking that you have been assigned to do (as by an instructor) | - |
| (noun) the instrument by which a claim or right or interest or property is transferred from one person to another | - |
| (noun) (law) a transfer of property by deed of conveyance | Synonyms: grant |
| assignor | (noun) (law) the party who makes an assignment | - |
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| assimilability | (noun) Capability of being taken in and utilized as nourishment. | - |
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| assimilable | (adjective) able to be absorbed and incorporated into body tissues | - |
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| assimilate | (verb) become similar to one's environment | - |
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| (verb) make similar | - |
| (verb) become similar in sound | - |
| (verb) take up mentally | Synonyms: absorb, ingest, take in |
| (verb) take (gas, light or heat) into a solution | Synonyms: imbibe |
| assimilating | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilative, assimilatory |
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| assimilation | (noun) in the theories of Jean Piaget: the application of a general schema to a particular instance | - |
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| (noun) the process of assimilating new ideas into an existing cognitive structure | Synonyms: acculturation |
| (noun) a linguistic process by which a sound becomes similar to an adjacent sound | - |
| (noun) the process of absorbing nutrients into the body after digestion | Synonyms: absorption |
| (noun) the social process of absorbing one cultural group into harmony with another | Synonyms: absorption |
| (noun) the state of being assimilated; people of different backgrounds come to see themselves as part of a larger national family | - |
| assimilative | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilatory |
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| (adjective) capable of mentally absorbing | - |
| assimilator | (noun) someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs | Synonyms: learner, scholar, student |
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| assimilatory | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilative |
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| assist | (noun) (sports) the act of enabling another player to make a good play | - |
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| (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assistance, help |
| (verb) act as an assistant in a subordinate or supportive function | - |
| (verb) work for, or be a servant to | Synonyms: attend, attend to, serve, wait on |
| (verb) give help or assistance; be of service | Synonyms: aid, help |
| assistance | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assist, help |
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| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: aid, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: aid, economic aid, economic assistance, financial aid, financial assistance |
| assistant | (adjective) of or relating to a person who is subordinate to another | Synonyms: adjunct |
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| (noun) a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: help, helper, supporter |
| assisted | (adjective) having help; often used as a combining form | Synonyms: aided |
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| assistive | (adjective) giving assistance | - |
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| assize | (noun) an ancient writ issued by a court of assize to the sheriff for the recovery of property | - |
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| (noun) the regulation of weights and measures of articles offered for sale | - |
| assizes | (noun) the county courts of England (replaced in 1971 by Crown courts) | Synonyms: court of assize, court of assize and nisi prius |
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| assuasive | (adjective) freeing from fear and anxiety | Synonyms: soothing |
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| astasia | (noun) inability to stand due to muscular incoordination | - |
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| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| astrophysical | (adjective) of or concerned with astrophysics | - |
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| astrophysicist | (noun) an astronomer who studies the physical properties of celestial bodies | - |
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| astrophysics | (noun) the branch of astronomy concerned with the physical and chemical properties of celestial bodies | - |
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| atelectasis | (noun) collapse of an expanded lung (especially in infants); also failure of pulmonary alveoli to expand at birth | - |
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| ateleiosis | (noun) a form of infantilism characterized by physical underdevelopment but normal intelligence | Synonyms: ateliosis |
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| ateliosis | (noun) a form of infantilism characterized by physical underdevelopment but normal intelligence | Synonyms: ateleiosis |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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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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| atopognosia | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosis |
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| atopognosis | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosia |
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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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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autogenesis | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogeny, spontaneous generation |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| auxesis | (noun) growth from increase in cell size without cell division | - |
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| aversion | (noun) the act of turning yourself (or your gaze) away | Synonyms: averting |
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| (noun) a feeling of intense dislike | Synonyms: antipathy, distaste |
| aversive | (adjective) tending to repel or dissuade | - |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avulsion | (noun) a forcible tearing or surgical separation of one body part from another | - |
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| (noun) an abrupt change in the course of a stream that forms the boundary between two parcels of land resulting in the loss of part of the land of one landowner and a consequent increase in the land of another | - |
| babysit | (verb) work or act as a baby-sitter | Synonyms: baby-sit, sit |
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| (verb) take watchful responsibility for | Synonyms: baby-sit |
| 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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| backside | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| (noun) the side of an object that is opposite its front | Synonyms: back end, rear |
| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| bagascosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagassosis |
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| bagassosis | (noun) alveolitis caused by inhaling bagasse (sugarcane dust) | Synonyms: bagascosis |
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| banausic | (adjective) (formal) ordinary and not refined | - |
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| 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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| basic | (adjective) pertaining to or constituting a base or basis | - |
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| (adjective) of or denoting or of the nature of or containing a base | - |
| (adjective) reduced to the simplest and most significant form possible without loss of generality | Synonyms: canonic, canonical |
| (adjective) serving as a base or starting point | Synonyms: introductory |
| (noun) (usually in the plural) a necessary commodity for which demand is constant | Synonyms: staple |
| basically | (adverb) in essence; at bottom or by one's (or its) very nature | Synonyms: essentially, fundamentally |
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| basics | (noun) principles from which other truths can be derived | Synonyms: basic principle, bedrock, fundamental principle, fundamentals |
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| (noun) a statement of fundamental facts or principles | Synonyms: rudiments |
| basidial | (adjective) relating to or characterized by basidia | - |
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| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| basidiomycete | (noun) any of various fungi of the subdivision Basidiomycota | Synonyms: basidiomycetous fungi |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiospore | (noun) a sexually produced fungal spore borne on a basidium | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| basidium | (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes | - |
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| basifixed | (adjective) attached by its base (as certain anthers to their filaments or stalks) | - |
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| basify | (verb) turn basic and less acidic | Synonyms: alkalify, alkalise, alkalize |
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| basil | (noun) leaves of the common basil; used fresh or dried | Synonyms: sweet basil |
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| (noun) any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum | - |
| basilar | (adjective) of or relating to or located at the base | Synonyms: basilary |
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