| aspartame | (noun) an artificial sweetener made from aspartic acid; used as a calorie-free sweetener | - |
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| aspect | (noun) the feelings expressed on a person's face | Synonyms: expression, face, facial expression, look |
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| (noun) a characteristic to be considered | - |
| (noun) a distinct feature or element in a problem | Synonyms: facet |
| (noun) the visual percept of a region | Synonyms: panorama, prospect, scene, view, vista |
| (noun) the beginning or duration or completion or repetition of the action of a verb | - |
| aspen | (noun) any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind | - |
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| asper | (noun) 20 aspers equal 1 kurus in Turkey | - |
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| 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 |
| asperity | (noun) something hard to endure | Synonyms: grimness, hardship, rigor, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) harshness of manner | Synonyms: sharpness |
| 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 |
| aspersorium | (noun) the basin or other vessel that holds holy water in Roman Catholic Churches | - |
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| (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspergill |
| asphalt | (noun) a dark bituminous substance found in natural beds and as residue from petroleum distillation; consists mainly of hydrocarbons | Synonyms: mineral pitch |
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| (noun) mixed asphalt and crushed gravel or sand; used especially for paving but also for roofing | - |
| asphodel | (noun) any of various chiefly Mediterranean plants of the genera Asphodeline and Asphodelus having linear leaves and racemes of white or pink or yellow flowers | - |
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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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| aspic | (noun) savory jelly based on fish or meat stock used as a mold for meats or vegetables | - |
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| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| aspirant | (noun) an ambitious and aspiring young person | Synonyms: aspirer, hopeful, wannabe, wannabee |
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| aspirate | (noun) a consonant pronounced with aspiration | - |
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| (noun) a speech sound having as an obvious concomitant an audible puff of breath, as initial stop consonants or initial h -sounds. | - |
| aspiration | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: breathing in, inhalation, inspiration, intake |
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| (noun) a will to succeed | - |
| (noun) a manner of articulation involving an audible release of breath | - |
| (noun) a cherished desire | Synonyms: ambition, dream |
| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| aspirer | (noun) an ambitious and aspiring young person | Synonyms: aspirant, hopeful, wannabe, wannabee |
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| aspirin | (noun) the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets | Synonyms: acetylsalicylic acid, Bayer, Empirin, St. Joseph |
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| associateship | (noun) the position of associate (as in an office or academy) | - |
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| assumption | (noun) the act of taking possession of or power over something | Synonyms: laying claim |
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| (noun) the act of assuming or taking for granted | - |
| (noun) audacious (even arrogant) behavior that you have no right to | Synonyms: effrontery, presumption, presumptuousness |
| (noun) a hypothesis that is taken for granted | Synonyms: supposal, supposition |
| (noun) a statement that is assumed to be true and from which a conclusion can be drawn | Synonyms: premise, premiss |
| 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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| asthenosphere | (noun) the lower layer of the crust | - |
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| astraphobia | (noun) a morbid fear of thunder and lightning | - |
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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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| asymptote | (noun) a straight line that is the limiting value of a curve; can be considered as tangent at infinity | - |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| atmosphere | (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, aura |
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| (noun) the mass of air surrounding the Earth | Synonyms: air |
| (noun) the envelope of gases surrounding any celestial body | - |
| (noun) a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade | Synonyms: atm, standard atmosphere, standard pressure |
| (noun) the weather or climate at some place | Synonyms: atmospheric state |
| (noun) a particular environment or surrounding influence | Synonyms: ambiance, ambience |
| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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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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| 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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| 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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| 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 |
| 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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| attempt | (noun) earnest and conscientious activity intended to do or accomplish something | Synonyms: effort, endeavor, endeavour, try |
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| (noun) the act of attacking | Synonyms: attack |
| attempter | (noun) one who tries | Synonyms: essayer, trier |
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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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| audiotape | (noun) magnetic tape for use in recording sound | - |
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| (noun) a tape recording of sound | - |
| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| auroscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, otoscope |
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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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| authorship | (noun) the act of creating written works | Synonyms: composition, penning, writing |
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| (noun) the act of initiating a new idea or theory or writing | Synonyms: paternity |
| autobiographer | (noun) someone who writes their own biography | - |
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| autobiography | (noun) a biography of yourself | - |
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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 |
| automysophobia | (noun) a morbid fear of being dirty | - |
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| autophyte | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophytic plant, autotroph, autotrophic organism |
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| autopilot | (noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course | Synonyms: automatic pilot, robot pilot |
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| (noun) a cognitive state in which you act without self-awareness | Synonyms: automatic pilot |
| 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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| 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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| 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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| autotroph | (noun) plant capable of synthesizing its own food from simple organic substances | Synonyms: autophyte, autophytic plant, autotrophic organism |
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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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| avoirdupois | (noun) excess bodily weight | Synonyms: blubber, fat, fatness |
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| (noun) a system of weights based on the 16-ounce pound (or 7,000 grains) | Synonyms: avoirdupois weight |
| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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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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| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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| backdrop | (noun) scenery hung at back of stage | Synonyms: backcloth, background |
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| backpack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, haversack, knapsack, packsack, rucksack |
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| backpacker | (noun) a hiker who wears a backpack | Synonyms: packer |
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| backpacking | (noun) carrying something in a pack on the back | Synonyms: packing |
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| backplate | (noun) plate armor protecting the back; worn as part of a cuirass | - |
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| backslapper | (noun) someone who demonstrates enthusiastic or excessive cordiality | - |
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| backspace | (noun) the typewriter key used for back spacing | Synonyms: backspace key, backspacer |
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| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| backspin | (noun) spin (usually of a moving ball) that retards or reverses the forward motion | - |
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| backstop | (noun) a precaution in case of an emergency | - |
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| (noun) (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field | - |
| (noun) (baseball) the person who plays the position of catcher | Synonyms: catcher |
| backup | (noun) the act of providing approval and support | Synonyms: backing, championship, patronage |
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| (noun) (computer science) a copy of a file or directory on a separate storage device | Synonyms: computer backup |
| (noun) a musical part (vocal or instrumental) that supports or provides background for other musical parts | Synonyms: accompaniment, musical accompaniment, support |
| (noun) someone who takes the place of another (as when things get dangerous or difficult) | Synonyms: backup man, fill-in, relief, reliever, stand-in, substitute |
| (noun) an accumulation caused by clogging or a stoppage | - |
| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacteriophage | (noun) a virus that is parasitic (reproduces itself) in bacteria | Synonyms: phage |
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| bagpipe | (noun) a tubular wind instrument; the player blows air into a bag and squeezes it out through the drone | - |
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| bagpiper | (noun) someone who plays the bagpipe | Synonyms: piper |
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| bailiffship | (noun) the office of bailiff | - |
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| bakeapple | (noun) creeping raspberry of north temperate regions with yellow or orange berries | Synonyms: baked-apple berry, cloudberry, dwarf mulberry, Rubus chamaemorus, salmonberry |
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| bakeshop | (noun) a workplace where baked goods (breads and cakes and pastries) are produced or sold | Synonyms: bakehouse, bakery |
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| balanoposthitis | (noun) inflammation of both the head of the penis and the foreskin | - |
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| baldpate | (noun) a widgeon the male of which has a white crown | Synonyms: American widgeon, Anas americana |
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| (noun) a person whose head is bald or shaved | Synonyms: baldhead, baldy, skin, skinhead |
| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| ballpark | (noun) a facility in which ball games are played (especially baseball games) | Synonyms: park |
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| (noun) near to the scope or range of something | Synonyms: approximate range |
| ballpen | (noun) a pen that has a small metal ball as the point of transfer of ink to paper | Synonyms: ballpoint, ballpoint pen, Biro |
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| ballplayer | (noun) an athlete who plays baseball | Synonyms: baseball player |
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| ballpoint | (noun) a pen that has a small metal ball as the point of transfer of ink to paper | Synonyms: ballpen, ballpoint pen, Biro |
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| ballup | (noun) something badly botched or muddled | Synonyms: balls-up, cockup, mess-up |
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| bankrupt | (noun) someone who has insufficient assets to cover their debts | Synonyms: insolvent |
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| 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 | - |
| bap | (noun) a small loaf or roll of soft bread | - |
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| baptism | (noun) a Christian sacrament signifying spiritual cleansing and rebirth | - |
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