| archbishopric | (noun) the territorial jurisdiction of an archbishop | - |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| archepiscopal | (adjective) of or associated with an archbishop | Synonyms: archiepiscopal |
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| archespore | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archesporium |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archesporium | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archespore |
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| archetypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypical, prototypal, prototypic, prototypical |
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| archetype | (noun) something that serves as a model or a basis for making copies | Synonyms: original, pilot |
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| archetypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, prototypal, prototypic, prototypical |
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| archiepiscopal | (adjective) of or associated with an archbishop | Synonyms: archepiscopal |
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| archipallium | (noun) the olfactory cortex of the cerebrum | Synonyms: paleocortex |
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| archipelagic | (adjective) relating to or part of an archipelago | - |
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| archipelago | (noun) a group of many islands in a large body of water | - |
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| archpriest | (noun) a senior clergyman and dignitary | Synonyms: hierarch, high priest, prelate, primate |
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| armpit | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: axilla, axillary cavity, axillary fossa |
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| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| arpeggio | (noun) a chord whose notes are played in rapid succession rather than simultaneously | - |
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| arpent | (noun) a former French unit of area; equal approximately to an acre | - |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| arteriography | (noun) roentgenographic examination of arteries | - |
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| arthrography | (noun) roentgenographic examination of a joint after injection of radiopaque contrast medium; produces an arthrogram | - |
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| arthropathy | (noun) a pathology or abnormality of a joint | - |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| arthropod | (noun) invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin | - |
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| arthropodal | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodan, arthropodous |
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| arthropodan | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodous |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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| arthroscopy | (noun) a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision | - |
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| arthrospore | (noun) one of a string of thick walled vegetative resting cells formed by some algae and fungi | - |
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| (noun) a body that resembles a spore but is not an endospore; produced by some bacteria | - |
| arthrosporic | (adjective) of or relating to arthrospores | Synonyms: arthrosporous |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ascospore | (noun) sexually produced fungal spore formed within an ascus | - |
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| ascosporic | (adjective) of or relating to ascospores | Synonyms: ascosporous |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| ascription | (noun) assigning to a cause or source | Synonyms: attribution |
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| (noun) assigning some quality or character to a person or thing | Synonyms: attribution |
| 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 |
| aseptic | (adjective) free of or using methods to keep free of pathological microorganisms | Synonyms: sterile |
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| asleep | (adjective) in a state of sleep | - |
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| (adjective) dead | Synonyms: at peace, at rest, deceased, departed, gone |
| (adjective) lacking sensation | Synonyms: benumbed, numb |
| (adverb) into a sleeping state | - |
| (adverb) in the sleep of death | - |
| aslope | (adjective) having an oblique or slanted direction | Synonyms: aslant, diagonal, slanted, slanting, sloped, sloping |
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| asp | (noun) of southern Europe; similar to but smaller than the adder | Synonyms: asp viper, Vipera aspis |
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| (noun) cobra used by the Pharaohs as a symbol of their power over life and death | Synonyms: Egyptian cobra, Naja haje |
| 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 |
| 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 | - |
| aspectual | (adjective) of or belonging to an aspect (as an aspect of the verb) | - |
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| 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 |
| asperse | (verb) charge falsely or with malicious intent; attack the good name and reputation of someone | Synonyms: besmirch, calumniate, defame, denigrate, slander, smear, smirch, sully |
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| 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 | - |
| (verb) cover with tar or asphalt | - |
| asphaltic | (adjective) containing asphalt | - |
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| aspheric | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspherical |
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| aspherical | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspheric |
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| 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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| asphyxiate | (verb) be asphyxiated; die from lack of oxygen | Synonyms: stifle, suffocate |
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| (verb) deprive of oxygen and prevent from breathing | Synonyms: smother, suffocate |
| (verb) impair the respiration of or obstruct the air passage of | Synonyms: choke, stifle, suffocate |
| asphyxiated | (adjective) in a state of asphyxia | - |
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| asphyxiating | (adjective) tending to deprive of oxygen | - |
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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 | (adjective) desiring or striving for recognition or advancement | Synonyms: aspiring, wishful |
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| (noun) an ambitious and aspiring young person | Synonyms: aspirer, hopeful, wannabe, wannabee |
| 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. | - |
| (verb) inhale (air, water, etc.) | - |
| (verb) pronounce with aspiration; of stop sounds | - |
| (verb) remove by suction | Synonyms: draw out, suck out |
| 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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| aspire | (verb) have an ambitious plan or a lofty goal | Synonyms: aim, draw a bead on, shoot for |
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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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| aspiring | (adjective) desiring or striving for recognition or advancement | Synonyms: aspirant, wishful |
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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 |
| assumptive | (adjective) accepted as real or true without proof | - |
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| (adjective) excessively forward | Synonyms: assuming, presumptuous |
| 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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| 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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| asymptomatic | (adjective) having no symptoms of illness or disease | Synonyms: symptomless |
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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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| asymptotic | (adjective) relating to or of the nature of an asymptote | - |
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| asymptotically | (adverb) toward an asymptote | - |
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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 |
| atmospheric | (adjective) relating to or located in the atmosphere | Synonyms: atmospherical |
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| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| atop | (adverb) on, to, or at the top | - |
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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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