| aeciospore | (noun) spore of a rust fungus formed in an aecium | - |
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| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| airspeed | (noun) the speed of an aircraft relative to the air in which it is flying | - |
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| allspice | (noun) ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves | - |
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| (noun) aromatic West Indian tree that produces allspice berries | Synonyms: allspice tree, Pimenta dioica, pimento tree |
| (noun) deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States | - |
| anaspid | (noun) extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian | - |
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| angiosperm | (noun) plants having seeds in a closed ovary | Synonyms: flowering plant |
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| angiospermous | (adjective) of or related to or characteristic of plants that are angiosperms | - |
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| antiperspirant | (noun) an astringent substance applied to the skin to reduce perspiration | - |
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| antispasmodic | (noun) a drug used to relieve or prevent spasms (especially of the smooth muscles) | Synonyms: antispasmodic agent, spasmolytic |
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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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| 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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| 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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| 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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| asthenosphere | (noun) the lower layer of the crust | - |
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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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| auspex | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: augur |
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| auspicate | (verb) commence in a manner calculated to bring good luck | - |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| auspice | (noun) a favorable omen | - |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| auspiciously | (adverb) in an auspicious manner | Synonyms: propitiously |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| backspace | (noun) the typewriter key used for back spacing | Synonyms: backspace key, backspacer |
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| (verb) hit the backspace key on a computer or typewriter keyboard | - |
| 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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| 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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| bathysphere | (noun) spherical deep diving apparatus (lowered by a cable) for underwater exploration | - |
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| bedspread | (noun) decorative cover for a bed | Synonyms: bed cover, bed covering, bedcover, counterpane, spread |
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| bedspring | (noun) (usually in the plural) one of the springs holding up the mattress of a bed | - |
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| bespangle | (verb) dot or sprinkle with sparkling or glittering objects | - |
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| (verb) decorate with spangles | Synonyms: spangle |
| bespatter | (verb) spot, splash, or soil | Synonyms: spatter |
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| bespeak | (verb) express the need or desire for | Synonyms: ask for, call for, quest, request |
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| (verb) be a signal for or a symptom of | Synonyms: betoken, indicate, point, signal |
| bespeckle | (verb) mark with small spots | Synonyms: speckle |
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| bespectacled | (adjective) wearing, or having the face adorned with, eyeglasses or an eyeglass | Synonyms: monocled, spectacled |
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| bespoke | (adjective) (of clothing) custom-made | Synonyms: bespoken, made-to-order, tailor-made, tailored |
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| bespoken | (adjective) pledged to be married | Synonyms: betrothed, engaged |
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| (adjective) (of clothing) custom-made | Synonyms: bespoke, made-to-order, tailor-made, tailored |
| bespot | (verb) mark with, or as if with, spots | - |
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| besprent | (adjective) sprinkled over | - |
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| besprinkle | (verb) scatter with liquid; wet lightly | Synonyms: sparge, sprinkle |
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| bicuspid | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspidate |
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| (noun) a tooth having two cusps or points; located between the incisors and the molars | Synonyms: premolar |
| bicuspidate | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspid |
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| biosphere | (noun) the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist | - |
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| bispak | (noun) A sexually promiscuous Indonesian woman | - |
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| blaspheme | (verb) utter obscenities or profanities | Synonyms: curse, cuss, imprecate, swear |
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| (verb) speak of in an irreverent or impious manner | - |
| blasphemer | (noun) a person who speaks disrespectfully of sacred things | - |
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| blasphemous | (adjective) characterized by profanity or cursing | Synonyms: blue, profane |
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| (adjective) grossly irreverent toward what is held to be sacred | Synonyms: profane, sacrilegious |
| blasphemously | (adverb) in a blasphemous manner | - |
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| blasphemy | (noun) blasphemous behavior; the act of depriving something of its sacred character | Synonyms: desecration, profanation, sacrilege |
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| (noun) blasphemous language (expressing disrespect for God or for something sacred) | - |
| blastosphere | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastula |
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| blastospheric | (adjective) of or relating to a blastula | Synonyms: blastular |
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| blepharospasm | (noun) spasm of the eyelid muscle resulting in closure of the eye | - |
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| bondsperson | (noun) someone who signs a bond as surety for someone else | - |
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| bowsprit | (noun) a spar projecting from the bow of a vessel | - |
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| bronchospasm | (noun) a spasm of the bronchi that makes exhalation difficult and noisy; associated with asthma and bronchitis | - |
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