| abrachia | (noun) the condition of having no arms | - |
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| academicianship | (noun) the position of member of an honorary academy | - |
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| acanthion | (noun) the craniometric point at the anterior extremity of the intermaxillary suture | - |
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| accountantship | (noun) the position of accountant | - |
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| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| achievement | (noun) the action of accomplishing something | Synonyms: accomplishment |
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| achiever | (noun) a person with a record of successes | Synonyms: succeeder, success, winner |
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| achillea | (noun) any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads | - |
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| achimenes | (noun) any plant of the genus Achimenes having showy bell-shaped flowers that resemble gloxinias | Synonyms: hot water plant |
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| aching | (noun) a dull persistent (usually moderately intense) pain | Synonyms: ache |
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| achira | (noun) canna grown especially for its edible rootstock from which arrowroot starch is obtained | Synonyms: arrowroot, Canna edulis, Canna indica, indian shot |
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| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| acidophile | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophil |
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| acidophilus | (noun) a bacterium that is used to make yogurt and to supplement probiotics | Synonyms: Lactobacillus acidophilus |
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| acquaintanceship | (noun) a relationship less intimate than friendship | Synonyms: acquaintance |
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| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| ahimsa | (noun) a Buddhist and Hindu and especially Jainist doctrine holding that all forms of life are sacred and urging the avoidance of violence | - |
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| airmanship | (noun) the art of operating aircraft | Synonyms: aviation |
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| airship | (noun) a steerable self-propelled aircraft | Synonyms: dirigible |
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| airworthiness | (noun) fitness to fly | - |
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| algophilia | (noun) sexual pleasure derived from inflicting or experiencing pain | Synonyms: algolagnia |
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| ambassadorship | (noun) the post of ambassador | - |
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| amphibia | (noun) the class of vertebrates that live on land but breed in water, frogs, toads, newts, salamanders, caecilians | Synonyms: class Amphibia |
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| amphibian | (noun) cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form | - |
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| (noun) an airplane designed to take off and land on water | Synonyms: amphibious aircraft |
| (noun) a flat-bottomed motor vehicle that can travel on land or water | Synonyms: amphibious vehicle |
| amphibole | (noun) a mineral or mineral variety belonging to the amphibole group | - |
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| amphibolite | (noun) a metamorphic rock composed chiefly of amphibole and plagioclase | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphiboly | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphibology |
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| amphibrach | (noun) a metrical unit with unstressed-stressed-unstressed syllables (e.g., `remember') | - |
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| amphictyony | (noun) an association of neighboring states or tribes in ancient Greece; established originally to defend a common religious center | - |
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| amphidiploid | (noun) (genetics) an organism or cell having a diploid set of chromosomes from each parent | - |
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| amphidiploidy | (noun) the condition of being amphidiploid | - |
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| amphigory | (noun) nonsensical writing (usually verse) | Synonyms: nonsense verse |
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| amphimixis | (noun) union of sperm and egg in sexual reproduction | - |
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| (noun) reproduction involving the union or fusion of a male and a female gamete | Synonyms: sexual reproduction |
| amphioxus | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: lancelet |
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| amphipod | (noun) a kind of malacostracan crustacean | - |
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| amphisbaena | (noun) (classical mythology) a serpent with a head at each end of its body | - |
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| amphitheater | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheatre, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheatre |
| amphitheatre | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheater, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheater |
| amphiuma | (noun) aquatic eel-shaped salamander having two pairs of very small feet; of still muddy waters in the southern United States | Synonyms: blind eel, congo eel, congo snake |
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| amyotrophia | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophy |
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| anacoluthia | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthon |
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| anamorphism | (noun) a distorted projection or perspective; especially an image distorted in such a way that it becomes visible only when viewed in a special manner | Synonyms: anamorphosis |
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| (noun) metamorphism that occurs deep under the earth's surface; changes simple minerals into complex minerals | - |
| (noun) the evolution of one type of organism from another by a long series of gradual changes | Synonyms: anamorphosis |
| anarchism | (noun) a political theory favoring the abolition of governments | - |
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| anarchist | (noun) an advocate of anarchism | Synonyms: nihilist, syndicalist |
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| angiohemophilia | (noun) a form of hemophilia discovered by Erik von Willebrand; a genetic disorder that is inherited as an autosomal recessive trait; characterized by a deficiency of the coagulation factor and by mucosal bleeding | Synonyms: vascular hemophilia, von Willebrand's disease |
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| anglophil | (noun) an admirer of England and things English | Synonyms: anglophile |
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| anglophile | (noun) an admirer of England and things English | Synonyms: anglophil |
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| anhidrosis | (noun) failure of the sweat glands | Synonyms: anhydrosis |
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| anhinga | (noun) fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill | Synonyms: darter, snakebird |
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| annihilation | (noun) destruction by annihilating something | Synonyms: obliteration |
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| (noun) total destruction | Synonyms: disintegration |
| annihilator | (noun) a total destroyer | - |
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| anorchia | (noun) absence of one of both testes | Synonyms: anorchidism, anorchism |
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| anorchidism | (noun) absence of one of both testes | Synonyms: anorchia, anorchism |
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| anorchism | (noun) absence of one of both testes | Synonyms: anorchia, anorchidism |
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| anorthite | (noun) rare plagioclastic feldspar occurring in many igneous rocks | - |
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| anthelminthic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
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| anthill | (noun) a mound of earth made by ants as they dig their nest | Synonyms: formicary |
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| anthropomorphism | (noun) the representation of objects (especially a god) as having human form or traits | Synonyms: theanthropism |
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| anthropopathism | (noun) Attribution of human feelings to things not human, such as inanimate objects, animals, or natural phenomena. | - |
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| antihistamine | (noun) a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site | - |
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| antisyphilitic | (noun) a drug (or other chemical agent) that is effective against syphilis | - |
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| aphid | (noun) any of various small plant-sucking insects | - |
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| apomorphine | (noun) a morphine derivative that is not as strong as morphine; used as an emetic and in small doses as a sedative | - |
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| apostleship | (noun) the position of apostle | - |
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| apparatchik | (noun) a communist who was a member of the administrative system of a communist party | - |
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| (noun) a humorous but derogatory term for an official of a large organization (especially a political organization) | - |
| apprenticeship | (noun) the position of apprentice | - |
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| approaching | (noun) the act of drawing spatially closer to something | Synonyms: approach, coming |
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| (noun) the temporal property of becoming nearer in time | Synonyms: approach, coming |
| (noun) the event of one object coming closer to another | Synonyms: approach |
| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| archil | (noun) any of various lecanoras that yield the dye archil | Synonyms: orchil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: cudbear, orchil |
| archimandrite | (noun) the superior of an abbey of monks | Synonyms: abbot |
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| archine | (noun) a Russian unit of length (71 cm) | - |
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| archipallium | (noun) the olfactory cortex of the cerebrum | Synonyms: paleocortex |
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| archipelago | (noun) a group of many islands in a large body of water | - |
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| architect | (noun) someone who creates plans to be used in making something (such as buildings) | Synonyms: designer |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| architecture | (noun) the profession of designing buildings and environments with consideration for their esthetic effect | - |
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| (noun) an architectural product or work | - |
| (noun) (computer science) the structure and organization of a computer's hardware or system software | Synonyms: computer architecture |
| (noun) the discipline dealing with the principles of design and construction and ornamentation of fine buildings | - |
| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| architrave | (noun) the lowest part of an entablature; rests immediately on the capitals of the columns | - |
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| (noun) the molding around a door or window | - |
| archive | (noun) a depository containing historical records and documents | - |
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| archives | (noun) collection of records especially about an institution | - |
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| archivist | (noun) a person in charge of collecting and cataloguing archives | - |
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| associateship | (noun) the position of associate (as in an office or academy) | - |
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| attorneyship | (noun) the position of attorney | - |
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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 |
| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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| bailiffship | (noun) the office of bailiff | - |
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| bakshis | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: backsheesh, baksheesh, bakshish, gratuity, pourboire, tip |
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| bakshish | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: backsheesh, baksheesh, bakshis, gratuity, pourboire, tip |
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| balanoposthitis | (noun) inflammation of both the head of the penis and the foreskin | - |
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| baldachin | (noun) ornamented canopy supported by columns or suspended from a roof or projected from a wall (as over an altar) | - |
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| banshie | (noun) (Irish folklore) a female spirit who wails to warn of impending death | Synonyms: banshee |
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| basophil | (noun) a leukocyte with basophilic granules easily stained by basic stains | Synonyms: basophile |
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| basophile | (noun) a leukocyte with basophilic granules easily stained by basic stains | Synonyms: basophil |
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| basophilia | (noun) the tendency of cells to stain with basic dyes | - |
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| bathing | (noun) immersing the body in water or sunshine | - |
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| (noun) the act of washing yourself (or another person) | Synonyms: washup |