| anastylosis | (noun) the archeological reassembly of ruined monuments from fallen or decayed fragments (incorporating new materials when necessary) | - |
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| anatomist | (noun) an expert in anatomy | - |
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| ancestor | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: antecedent, ascendant, ascendent, root |
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| ancestress | (noun) a woman ancestor | - |
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| ancestry | (noun) inherited properties shared with others of your bloodline | Synonyms: derivation, filiation, lineage |
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| (noun) the hereditary derivation of an individual | Synonyms: blood, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| anecdotist | (noun) a person skilled in telling anecdotes | Synonyms: raconteur |
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| anesthesia | (noun) loss of bodily sensation with or without loss of consciousness | Synonyms: anaesthesia |
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| anesthesiologist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anaesthetist, anesthetist |
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| anesthesiology | (noun) the branch of medical science that studies and applies anesthetics | - |
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| anesthetic | (noun) a drug that causes temporary loss of bodily sensations | Synonyms: anaesthetic, anaesthetic agent, anesthetic agent |
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| anesthetist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anaesthetist, anesthesiologist |
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| anesthyl | (noun) a mixture of methyl and ethyl chloride; sprayed on as a local anesthetic | - |
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| anestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrus, anoestrum, anoestrus |
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| anestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anoestrum, anoestrus |
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| angiologist | (noun) a physician who specializes in angiology | - |
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| angioplasty | (noun) an operation to repair a damaged blood vessel or unblock a coronary artery | - |
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| angostura | (noun) the bitter bark of a South American tree; used in medicines and liqueurs and bitters | Synonyms: angostura bark |
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| angst | (noun) an acute but unspecific feeling of anxiety; usually reserved for philosophical anxiety about the world or about personal freedom | - |
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| angstrom | (noun) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation | Synonyms: A, angstrom unit |
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| animist | (noun) one who accepts the doctrine of animism | - |
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| annalist | (noun) a historian who writes annals | - |
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| anoestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrus |
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| anoestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrum |
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| anomalist | (noun) someone who has a special interest in exceptional cases | - |
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| antagonist | (noun) a drug that neutralizes or counteracts the effects of another drug | - |
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| (noun) a muscle that relaxes while another contracts | - |
| (noun) someone who offers opposition | Synonyms: adversary, opponent, opposer, resister |
| anthologist | (noun) an editor who makes selections for an anthology | - |
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| anthropologist | (noun) a social scientist who specializes in anthropology | - |
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| anticatalyst | (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst | - |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| antifeminist | (noun) someone who does not believe in the social or economic or political equality of men and women | - |
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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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| antineoplastic | (noun) any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function | Synonyms: antineoplastic drug, cancer drug |
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| antipasto | (noun) a course of appetizers in an Italian meal | - |
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| antistrophe | (noun) the section of a choral ode answering a previous strophe in classical Greek drama; the second of two metrically corresponding sections in a poem | - |
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| aorist | (noun) a verb tense in some languages (classical Greek and Sanskrit) expressing action (especially past action) without indicating its completion or continuation | - |
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| aphorist | (noun) someone who formulates aphorisms or who repeats aphorisms | - |
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| apiarist | (noun) a farmer who keeps bees for their honey | Synonyms: apiculturist, beekeeper |
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| apiculturist | (noun) a farmer who keeps bees for their honey | Synonyms: apiarist, beekeeper |
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| apologist | (noun) a person who argues to defend or justify some policy or institution | Synonyms: justifier, vindicator |
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| apostasy | (noun) the act of abandoning a party for cause | Synonyms: tergiversation |
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| (noun) the state of having rejected your religious beliefs for your political party or a cause (often in favor of opposing beliefs or causes) | Synonyms: defection, renunciation |
| apostate | (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: deserter, ratter, recreant, renegade, turncoat |
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| apostle | (noun) an ardent early supporter of a cause or reform | - |
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| apostleship | (noun) the position of apostle | - |
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| apostrophe | (noun) address to an absent or imaginary person | - |
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| (noun) the mark (') used to indicate the omission of one or more letters from a printed word | - |
| arbalest | (noun) late version of the crossbow with a steel bow | Synonyms: arbalist |
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| arbalist | (noun) late version of the crossbow with a steel bow | Synonyms: arbalest |
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| (noun) archer who uses an arbalest | - |
| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| archaeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archeologist |
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| archaist | (noun) an expert or collector of antiquities | Synonyms: antiquarian, antiquary |
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| (noun) a person who archaizes | - |
| archeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archaeologist |
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| archivist | (noun) a person in charge of collecting and cataloguing archives | - |
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| archpriest | (noun) a senior clergyman and dignitary | Synonyms: hierarch, high priest, prelate, primate |
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| arianist | (noun) an adherent of Arianism (the belief that Jesus Christ was not truly God) | - |
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| arista | (noun) bristlelike process near the tip of the antenna of certain flies | - |
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| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| aristocrat | (noun) a member of the aristocracy | Synonyms: blue blood, patrician |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| armistice | (noun) a state of peace agreed to between opponents so they can discuss peace terms | Synonyms: cease-fire, truce |
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| armrest | (noun) a support for the arm | - |
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| arrest | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: apprehension, catch, collar, pinch, taking into custody |
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| (noun) the state of inactivity following an interruption | Synonyms: check, halt, hitch, stay, stop, stoppage |
| arrester | (noun) a restraint that slows airplanes as they land on the flight deck of an aircraft carrier | Synonyms: arrester hook |
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| arriviste | (noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class | Synonyms: nouveau-riche, parvenu, upstart |
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| arsonist | (noun) a criminal who illegally sets fire to property | Synonyms: firebug, incendiary |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| artist | (noun) a person whose creative work shows sensitivity and imagination | Synonyms: creative person |
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| artiste | (noun) a public performer (a dancer or singer) | - |
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| artistry | (noun) a superior skill that you can learn by study and practice and observation | Synonyms: art, prowess |
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| asbestos | (noun) a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer | - |
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| asbestosis | (noun) lung disease caused by inhaling asbestos particles | - |
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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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| assist | (noun) (sports) the act of enabling another player to make a good play | - |
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| (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assistance, help |
| assistance | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assist, help |
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| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: aid, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: aid, economic aid, economic assistance, financial aid, financial assistance |
| assistant | (noun) a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: help, helper, supporter |
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| astasia | (noun) inability to stand due to muscular incoordination | - |
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| astatine | (noun) a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium | Synonyms: At, atomic number 85 |
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| aster | (noun) star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis | - |
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| (noun) any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers | - |
| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| asterisk | (noun) a star-shaped character * used in printing | Synonyms: star |
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| asterism | (noun) (astronomy) a cluster of stars (or a small constellation) | - |
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| (noun) (mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light | - |
| asteroid | (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
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| asthenia | (noun) an abnormal loss of strength | Synonyms: astheny |
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| 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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| astheny | (noun) an abnormal loss of strength | Synonyms: asthenia |
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| asthma | (noun) respiratory disorder characterized by wheezing; usually of allergic origin | Synonyms: asthma attack, bronchial asthma |
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| asthmatic | (noun) a person suffering from asthma | - |
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| astigmatism | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmia |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmia |
| astigmia | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmatism |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmatism |
| astilbe | (noun) any plant of the genus Astilbe having compound leaves and showy panicles of tiny colorful flowers | - |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astragal | (noun) a beaded molding for edging or decorating furniture | Synonyms: bead, beading, beadwork |
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| (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragalus, talus |
| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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| astrakhan | (noun) the fur of young lambs | - |
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| astrantia | (noun) any plant of the genus Astrantia | Synonyms: masterwort |
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| astraphobia | (noun) a morbid fear of thunder and lightning | - |
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