| appendix | (noun) a vestigial process that extends from the lower end of the cecum and that resembles a small pouch | Synonyms: cecal appendage, vermiform appendix, vermiform process |
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| (noun) supplementary material that is collected and appended at the back of a book | - |
| apperception | (noun) the process whereby perceived qualities of an object are related to past experience | - |
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| appetence | (noun) a feeling of craving something | Synonyms: appetency, appetite |
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| appetency | (noun) a feeling of craving something | Synonyms: appetence, appetite |
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| appetiser | (noun) food or drink to stimulate the appetite (usually served before a meal or as the first course) | Synonyms: appetizer, starter |
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| appetisingness | (noun) the property of stimulating the appetite | Synonyms: appetizingness |
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| appetite | (noun) a feeling of craving something | Synonyms: appetence, appetency |
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| appetizer | (noun) food or drink to stimulate the appetite (usually served before a meal or as the first course) | Synonyms: appetiser, starter |
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| appetizingness | (noun) the property of stimulating the appetite | Synonyms: appetisingness |
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| applauder | (noun) someone who applauds | Synonyms: clapper |
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| applause | (noun) a demonstration of approval by clapping the hands together | Synonyms: clapping, hand clapping |
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| apple | (noun) fruit with red or yellow or green skin and sweet to tart crisp whitish flesh | - |
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| (noun) native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits | Synonyms: Malus pumila, orchard apple tree |
| applecart | (noun) a handcart from which apples and other fruit are sold in the street | - |
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| (noun) the planning that is disrupted when someone `upsets the applecart' | - |
| applejack | (noun) distilled from hard cider | - |
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| applemint | (noun) mint with apple-scented stems of southern and western Europe; naturalized in United States | Synonyms: apple mint, Mentha rotundifolia, Mentha suaveolens |
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| applesauce | (noun) nonsensical talk or writing | Synonyms: codswallop, folderol, rubbish, trash, tripe, trumpery, wish-wash |
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| (noun) puree of stewed apples usually sweetened and spiced | Synonyms: apple sauce |
| applet | (noun) a Java application; an application program that uses the client's web browser to provide a user interface | - |
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| applewood | (noun) wood of any of various apple trees of the genus Malus | - |
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| appliance | (noun) durable goods for home or office use | - |
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| (noun) a device or control that is very useful for a particular job | Synonyms: contraption, contrivance, convenience, gadget, gismo, gizmo, widget |
| applicability | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: pertinence, pertinency |
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| applicant | (noun) a person who requests or seeks something such as assistance or employment or admission | Synonyms: applier |
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| application | (noun) the action of putting something into operation | - |
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| (noun) a diligent effort | Synonyms: diligence |
| (noun) the act of bringing something to bear; using it for a particular purpose | Synonyms: practical application |
| (noun) the work of applying something | Synonyms: coating, covering |
| (noun) liquid preparation having a soothing or antiseptic or medicinal action when applied to the skin | Synonyms: lotion |
| (noun) a verbal or written request for assistance or employment or admission to a school | - |
| (noun) a program that gives a computer instructions that provide the user with tools to accomplish a task | Synonyms: application program, applications programme |
| applicator | (noun) a device for applying a substance | Synonyms: applier |
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| applier | (noun) a device for applying a substance | Synonyms: applicator |
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| (noun) a person who requests or seeks something such as assistance or employment or admission | Synonyms: applicant |
| applique | (noun) a decorative design made of one material sewn over another | - |
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| appoggiatura | (noun) an embellishing note usually written in smaller size | Synonyms: acciaccatura, grace note |
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| appointee | (noun) an official who is appointed | - |
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| (noun) a person who is appointed to a job or position | Synonyms: appointment |
| appointment | (noun) the act of putting a person into a non-elective position | Synonyms: assignment, designation, naming |
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| (noun) the job to which you are (or hope to be) appointed | - |
| (noun) (law) the act of disposing of property by virtue of the power of appointment | - |
| (noun) (usually in the plural) furnishings and equipment (especially for a ship or hotel) | Synonyms: fitting |
| (noun) a meeting arranged in advance | Synonyms: date, engagement |
| (noun) a person who is appointed to a job or position | Synonyms: appointee |
| apportioning | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportionment, assignation, parceling, parcelling |
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| apportionment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportioning, assignation, parceling, parcelling |
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| appositeness | (noun) appropriateness for the occasion | Synonyms: aptness |
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| apposition | (noun) the act of positioning close together (or side by side) | Synonyms: collocation, juxtaposition |
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| (noun) (biology) growth in the thickness of a cell wall by the deposit of successive layers of material | - |
| (noun) a grammatical relation between a word and a noun phrase that follows | - |
| appraisal | (noun) an expert estimation of the quality, quantity, and other characteristics of someone or something | - |
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| (noun) the classification of someone or something with respect to its worth | Synonyms: assessment |
| (noun) a document appraising the value of something (as for insurance or taxation) | Synonyms: estimate, estimation |
| appraiser | (noun) one who estimates officially the worth or value or quality of things | Synonyms: valuator |
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| (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: authenticator |
| appreciation | (noun) a favorable judgment | Synonyms: admiration |
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| (noun) an increase in price or value | - |
| (noun) understanding of the nature or meaning or quality or magnitude of something | Synonyms: grasp, hold |
| (noun) delicate discrimination (especially of esthetic values) | Synonyms: discernment, perceptiveness, taste |
| (noun) an expression of gratitude | - |
| appreciativeness | (noun) warm friendly feelings of gratitude | Synonyms: gratefulness, thankfulness |
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| appreciator | (noun) a person who is fully aware of something and understands it | - |
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| apprehender | (noun) a person who seizes or arrests (especially a person who seizes or arrests in the name of justice) | - |
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| (noun) a person who knows or apprehends | Synonyms: knower |
| apprehension | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: arrest, catch, collar, pinch, taking into custody |
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| (noun) the cognitive condition of someone who understands | Synonyms: discernment, savvy, understanding |
| (noun) painful expectation | Synonyms: misgiving |
| (noun) fearful expectation or anticipation | Synonyms: apprehensiveness, dread |
| apprehensiveness | (noun) fearful expectation or anticipation | Synonyms: apprehension, dread |
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| apprentice | (noun) works for an expert to learn a trade | Synonyms: learner, prentice |
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| apprenticeship | (noun) the position of apprentice | - |
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| apprisal | (noun) informing by words | Synonyms: notification, telling |
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| appro | (noun) an informal British abbreviation of approval | - |
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| approach | (noun) the act of drawing spatially closer to something | Synonyms: approaching, coming |
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| (noun) a relatively short golf shot intended to put the ball onto the putting green | Synonyms: approach shot |
| (noun) ideas or actions intended to deal with a problem or situation | Synonyms: attack, plan of attack |
| (noun) a way of entering or leaving | Synonyms: access |
| (noun) the temporal property of becoming nearer in time | Synonyms: approaching, coming |
| (noun) a close approximation | - |
| (noun) a tentative suggestion designed to elicit the reactions of others | Synonyms: advance, feeler, overture |
| (noun) the event of one object coming closer to another | Synonyms: approaching |
| (noun) the final path followed by an aircraft as it is landing | Synonyms: approach path, glide path, glide slope |
| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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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 |
| approbation | (noun) official recognition or approval | - |
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| (noun) official approval | - |
| appropriateness | (noun) the quality of being specially suitable | - |
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| (noun) appropriate conduct; doing the right thing | Synonyms: rightness |
| appropriation | (noun) a deliberate act of acquisition of something, often without the permission of the owner | - |
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| (noun) incorporation by joining or uniting | Synonyms: annexation |
| (noun) money set aside (as by a legislature) for a specific purpose | - |
| appropriator | (noun) someone who takes for his or her own use (especially without permission) | - |
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| approval | (noun) the formal act of approving | Synonyms: approving, blessing |
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| (noun) a message expressing a favorable opinion | Synonyms: commendation |
| (noun) a feeling of liking something or someone good | - |
| (noun) acceptance as satisfactory | Synonyms: favorable reception, favourable reception |
| approver | (noun) an authority with power to approve | - |
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| approving | (noun) the formal act of approving | Synonyms: approval, blessing |
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| approximation | (noun) the act of bringing near or bringing together especially the cut edges of tissue | Synonyms: bringing close together |
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| (noun) the quality of coming near to identity (especially close in quantity) | - |
| (noun) an approximate calculation of quantity or degree or worth | Synonyms: estimate, estimation, idea |
| (noun) an imprecise or incomplete account | - |
| appurtenance | (noun) a supplementary component that improves capability | Synonyms: accessory, add-on, supplement |
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| (noun) equipment consisting of miscellaneous articles needed for a particular operation or sport etc. | Synonyms: gear, paraphernalia |
| apraxia | (noun) inability to make purposeful movements | - |
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| apricot | (noun) a shade of pink tinged with yellow | Synonyms: peach, salmon pink, yellowish pink |
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| (noun) downy yellow to rosy-colored fruit resembling a small peach | - |
| (noun) Asian tree having clusters of usually white blossoms and edible fruit resembling the peach | Synonyms: apricot tree |
| apriorism | (noun) belief in a priori principles or reasoning; specifically : the doctrine that knowledge rests upon principles that are self-evident to reason or are presupposed by experience in general. | - |
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| apron | (noun) a garment of cloth or leather or plastic that is tied about the waist and worn to protect your clothing | - |
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| (noun) a paved surface where aircraft stand while not being used | - |
| (noun) the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain) | Synonyms: forestage, proscenium |
| (noun) (golf) the part of the fairway leading onto the green | - |
| apse | (noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar | Synonyms: apsis |
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| apsis | (noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar | Synonyms: apse |
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| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| aptitude | (noun) inherent ability | - |
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| aptness | (noun) appropriateness for the occasion | Synonyms: appositeness |
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| (noun) a disposition to behave in a certain way | Synonyms: propensity |
| aquaphobia | (noun) a morbid fear of drowning | - |
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| aquaplane | (noun) a board that is pulled by a speedboat as a person stands on it and skims over the top of the water | - |
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| arachnophobia | (noun) a morbid fear of spiders | - |
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| archaeopteryx | (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 lithographica, archeopteryx |
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| archbishop | (noun) a bishop of highest rank | - |
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| 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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| archespore | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archesporium |
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| archesporium | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archespore |
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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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| 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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| 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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| 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 | - |
| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| ascospore | (noun) sexually produced fungal spore formed within an ascus | - |
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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 |
| 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 |