| arteriography | (noun) roentgenographic examination of arteries | - |
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| arthralgia | (noun) pain in a joint or joints | - |
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| arthrogram | (noun) an X ray of a joint after the injection of a contrast medium | - |
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| arthrography | (noun) roentgenographic examination of a joint after injection of radiopaque contrast medium; produces an arthrogram | - |
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| artlang | (noun) a constructed language designed for aesthetic pleasure. | Synonyms: artistic language |
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| arugula | (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket, rocket salad, roquette |
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| ascending | (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
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| asking | (noun) the verbal act of requesting | Synonyms: request |
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| asparaginase | (noun) antineoplastic drug (trade name Elspar) sometimes used to treat lymphoblastic leukemia | Synonyms: Elspar |
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| asparagine | (noun) a crystalline amino acid found in proteins and in many plants (e.g., asparagus) | - |
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| asparagus | (noun) edible young shoots of the asparagus plant | - |
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| (noun) plant whose succulent young shoots are cooked and eaten as a vegetable | Synonyms: Asparagus officinales, edible asparagus |
| aspergill | (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspersorium |
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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 |
| assagai | (noun) the slender spear of the Bantu-speaking people of Africa | Synonyms: assegai |
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| assegai | (noun) the slender spear of the Bantu-speaking people of Africa | Synonyms: assagai |
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| assemblage | (noun) the social act of assembling | Synonyms: assembly, gathering |
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| (noun) a system of components assembled together for a particular purpose | Synonyms: hookup |
| (noun) a group of persons together in one place | Synonyms: gathering |
| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, aggregation, collection |
| assembling | (noun) the act of gathering something together | Synonyms: aggregation, collecting, collection |
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| assenting | (noun) agreeing with or consenting to (often unwillingly) | Synonyms: accession |
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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 |
| 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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| assuagement | (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: alleviation, relief |
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| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| astigmatism | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmia |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmia |
| 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 |
| astragal | (noun) a beaded molding for edging or decorating furniture | Synonyms: bead, beading, beadwork |
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| (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragalus, talus |
| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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| astringence | (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringency |
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| astringency | (noun) the ability to contract or draw together soft body tissues to check blood flow or restrict secretion of fluids | Synonyms: stypsis |
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| (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringence |
| astringent | (noun) a drug that causes contraction of body tissues and canals | Synonyms: astringent drug, styptic |
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| astrobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: exobiology, space biology |
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| astrogator | (noun) the navigator of a spacecraft | - |
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| astroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: macroglia |
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| astrologer | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologist |
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| astrologist | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologer |
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| astrology | (noun) a pseudoscience claiming divination by the positions of the planets and sun and moon | Synonyms: star divination |
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| astronavigation | (noun) navigating according to the positions of the stars | Synonyms: celestial navigation |
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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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| asynergy | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergia |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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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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| attending | (noun) the act of being present (at a meeting or event etc.) | Synonyms: attendance |
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| (noun) the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others | Synonyms: attention |
| auberge | (noun) a hotel providing overnight lodging for travelers | Synonyms: hostel, hostelry, inn, lodge |
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| aubergine | (noun) egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow | Synonyms: eggplant, mad apple |
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| (noun) hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable | Synonyms: brinjal, eggplant, eggplant bush, garden egg, mad apple, Solanum melongena |
| audiogram | (noun) a graphical representation of a person's auditory sensitivity to sound | - |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| augend | (noun) a number to which another number (the addend) is added | - |
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| auger | (noun) hand tool for boring holes | Synonyms: gimlet, screw auger, wimble |
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| (noun) a long flexible steel coil for dislodging stoppages in curved pipes | Synonyms: plumber's snake, snake |
| aught | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
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| augite | (noun) dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium | - |
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| augmentation | (noun) the act of augmenting | - |
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| (noun) the statement of a theme in notes of greater duration (usually twice the length of the original) | - |
| (noun) the amount by which something becomes greater | - |
| augur | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: auspex |
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| augury | (noun) an event that is experienced as indicating important things to come | Synonyms: foretoken, preindication, sign |
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| autobiographer | (noun) someone who writes their own biography | - |
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| autobiography | (noun) a biography of yourself | - |
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| autogamy | (noun) self-fertilization in plants | - |
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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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| autogenics | (noun) training patients in self-induced relaxation | Synonyms: autogenic therapy, autogenic training |
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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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| autogiro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogyro, gyroplane |
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| autograft | (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autoplasty |
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| autograph | (noun) something written by one's own hand | - |
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| (noun) a person's own signature | Synonyms: John Hancock |
| 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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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| autoregulation | (noun) (physiology) processes that maintain a generally constant physiological state in a cell or organism | - |
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| autosexing | (noun) (especially of domestic fowl) breeding to reveal differential sex characteristics at hatching | - |
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| autosuggestion | (noun) a system for self-improvement developed by Emile Coue which was popular in the 1920s and 1930s | Synonyms: auto-suggestion, self-suggestion |
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| avenger | (noun) someone who takes vengeance | Synonyms: retaliator |
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| average | (noun) a statistic describing the location of a distribution | Synonyms: norm |
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| (noun) an intermediate scale value regarded as normal or usual | - |
| (noun) (sports) the ratio of successful performances to opportunities | - |
| averageness | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: mediocrity |
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| (noun) the state of being that is average; indicates normality but with connotations of mediocrity | - |
| averting | (noun) the act of preventing something from occurring | - |
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| (noun) the act of turning yourself (or your gaze) away | Synonyms: aversion |
| awakening | (noun) the act of waking | Synonyms: wakening, waking up |
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| awarding | (noun) a grant made by a law court | Synonyms: award |
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| awning | (noun) a canopy made of canvas to shelter people or things from rain or sun | Synonyms: sunblind, sunshade |
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| axiology | (noun) the study of values and value judgments | - |
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| babbitting | (noun) lining a surface or bearing with Babbitt metal | - |
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| babbling | (noun) gibberish resembling the sounds of a baby | Synonyms: babble, lallation |
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| babygram | (noun) an X-ray of the entire body of an infant. | - |
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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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| backflowing | (noun) a flow that returns toward its source | Synonyms: backflow |
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| backgammon | (noun) a board game for two players; pieces move according to throws of the dice | - |
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| background | (noun) scenery hung at back of stage | Synonyms: backcloth, backdrop |
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| (noun) (computer science) the area of the screen in graphical user interfaces against which icons and windows appear | Synonyms: desktop, screen background |
| (noun) a person's social heritage: previous experience or training | - |
| (noun) the part of a scene (or picture) that lies behind objects in the foreground | Synonyms: ground |
| (noun) information that is essential to understanding a situation or problem | Synonyms: background knowledge |
| (noun) extraneous signals that can be confused with the phenomenon to be observed or measured | Synonyms: background signal |
| (noun) relatively unimportant or inconspicuous accompanying situation | - |
| (noun) the state of the environment in which a situation exists | Synonyms: scope, setting |
| backgrounder | (noun) a press conference or interview in which a government official explains to reporters the background of an action or policy | - |
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| backgrounding | (noun) the execution of low priority programs while higher priority programs are not using the processing system | Synonyms: background processing |
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| backing | (noun) the act of providing approval and support | Synonyms: backup, championship, patronage |
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| (noun) something forming a back that is added for strengthening | Synonyms: mount |
| (noun) financial resources provided to make some project possible | Synonyms: financial backing, financial support, funding, support |
| backlighting | (noun) lighting from behind | - |
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| backlog | (noun) an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services) | - |
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| (noun) something kept back or saved for future use or a special purpose | Synonyms: reserve, stockpile |
| (noun) the large log at the back of a hearth fire | - |
| backpacking | (noun) carrying something in a pack on the back | Synonyms: packing |
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| backsliding | (noun) a failure to maintain a higher state | Synonyms: lapse, lapsing, relapse, relapsing, reversion, reverting |
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| backstage | (noun) a stage area out of sight of the audience | Synonyms: offstage, wing |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bacteriophage | (noun) a virus that is parasitic (reproduces itself) in bacteria | Synonyms: phage |
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| badge | (noun) any feature that is regarded as a sign of status (a particular power or quality or rank) | - |
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| (noun) an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.) | - |
| badger | (noun) sturdy carnivorous burrowing mammal with strong claws; widely distributed in the Northern Hemisphere | - |
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