| 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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| 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 | - |
| 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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| blasphemer | (noun) a person who speaks disrespectfully of sacred things | - |
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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) | - |
| caspase | (noun) any of a group of proteases that mediate apoptosis | - |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| clasp | (noun) the act of grasping | Synonyms: clench, clutch, clutches, grasp, grip, hold |
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| (noun) a fastener (as a buckle or hook) that is used to hold two things together | - |
| diaspora | (noun) the dispersion or spreading of something that was originally localized (as a people or language or culture) | - |
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| (noun) the body of Jews (or Jewish communities) outside Palestine or modern Israel | - |
| exasperation | (noun) actions that cause great irritation (or even anger) | - |
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| (noun) an exasperated feeling of annoyance | Synonyms: aggravation |
| gasp | (noun) a short labored intake of breath with the mouth open | Synonyms: pant |
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| grasp | (noun) the act of grasping | Synonyms: clasp, clench, clutch, clutches, grip, hold |
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| (noun) an intellectual hold or understanding | Synonyms: grip |
| (noun) understanding of the nature or meaning or quality or magnitude of something | Synonyms: appreciation, hold |
| (noun) the limit of capability | Synonyms: compass, range, reach |
| graspability | (noun) The quality of being able to be understood or comprehended; understandability. | - |
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| grasping | (noun) the act of gripping something firmly with the hands (or the tentacles) | Synonyms: prehension, seizing, taking hold |
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| (noun) understanding with difficulty | - |
| handclasp | (noun) grasping and shaking a person's hand (as to acknowledge an introduction or to agree on a contract) | Synonyms: handshake, handshaking, shake |
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| hasp | (noun) a fastener for a door or lid; a hinged metal plate is fitted over a staple and is locked with a pin or padlock | - |
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| jasper | (noun) an opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone | - |
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| megasporangium | (noun) a plant structure that produces megaspores | Synonyms: macrosporangium |
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| megaspore | (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte | Synonyms: macrospore |
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| megasporophyll | (noun) in non-flowering plants, a sporophyll that bears only megasporangia | - |
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| paspalum | (noun) tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States | Synonyms: dallis grass, dallisgrass, Paspalum dilatatum |
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| rasp | (noun) a coarse file with sharp pointed projections | Synonyms: wood file |
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| (noun) uttering in an irritated tone | Synonyms: rasping |
| raspberry | (noun) a cry or noise made to express displeasure or contempt | Synonyms: bird, boo, Bronx cheer, hiss, hoot, razz, razzing, snort |
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| (noun) red or black edible aggregate berries usually smaller than the related blackberries | - |
| (noun) woody brambles bearing usually red but sometimes black or yellow fruits that separate from the receptacle when ripe and are rounder and smaller than blackberries | Synonyms: raspberry bush |
| raspiness | (noun) (of sound) The state or characteristic of being rough or raw, especially used to describe vocal quality. | - |
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| rasping | (noun) uttering in an irritated tone | Synonyms: rasp |
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| teaspoon | (noun) a small spoon used for stirring tea or coffee; holds about one fluid dram | - |
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| (noun) as much as a teaspoon will hold | Synonyms: teaspoonful |
| teaspoonful | (noun) as much as a teaspoon will hold | Synonyms: teaspoon |
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| tetrasporangium | (noun) a sporangium containing four asexual spores | - |
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| tetraspore | (noun) one of the four asexual spores produced within a sporangium | - |
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| wasp | (noun) social or solitary hymenopterans typically having a slender body with the abdomen attached by a narrow stalk and having a formidable sting | - |
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