| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| abducting | (adjective) especially of muscles; drawing away from the midline of the body or from an adjacent part | Synonyms: abducent |
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| abstinence | (noun) act or practice of refraining from indulging an appetite | - |
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| (noun) the trait of abstaining (especially from alcohol) | Synonyms: abstention |
| abstinent | (adjective) self-restraining; not indulging an appetite especially for food or drink | Synonyms: abstentious |
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| (noun) a person who refrains from drinking intoxicating beverages | Synonyms: abstainer, nondrinker |
| accenting | (noun) the act of giving special importance or significance to something | Synonyms: accentuation, emphasizing |
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| accepting | (adjective) tolerating without protest | - |
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| accommodating | (adjective) helpful in bringing about a harmonious adaptation | Synonyms: accommodative |
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| (adjective) obliging; willing to do favors | - |
| accommodatingly | (adverb) in accommodation | Synonyms: obligingly |
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| accounting | (noun) the occupation of maintaining and auditing records and preparing financial reports for a business | Synonyms: accountancy |
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| (noun) a system that provides quantitative information about finances | - |
| (noun) a convincing explanation that reveals basic causes | - |
| (noun) a statement of recent transactions and the resulting balance | Synonyms: account, account statement |
| (noun) a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts | Synonyms: accounting system, method of accounting |
| acetin | (noun) any of three liquid acetates that are formed when acetic acid and glycerin are heated together | - |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| achromatinic | (adjective) (of substance of a cell nucleus) not readily colored by stains | - |
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| actin | (noun) one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| acting | (adjective) serving temporarily especially as a substitute | - |
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| (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| actinian | (noun) any sea anemone or related animal | Synonyms: actinia, actiniarian |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| actinism | (noun) the property of radiation that enables it to produce photochemical effects | - |
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| actinium | (noun) a radioactive element of the actinide series; found in uranium ores | Synonyms: Ac, atomic number 89 |
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| actinoid | (adjective) having a radial form | - |
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| (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomorphous | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphic |
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| actinomyces | (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites | - |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| actinomycin | (noun) any of various red antibiotics isolated from soil bacteria | - |
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| actinomycosis | (noun) disease of cattle that can be transmitted to humans; results from infection with actinomycetes; characterized by hard swellings that exude pus through long sinuses | - |
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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| actinon | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinoid |
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| actinopod | (noun) protozoa having stiff rodlike radiating pseudopods | - |
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| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| actinozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: anthozoan |
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| activating | (adjective) causing motion or action or change | Synonyms: actuating |
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| (noun) the activity of causing to have energy and be active | Synonyms: activation, energizing |
| actuating | (adjective) causing motion or action or change | Synonyms: activating |
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| adamantine | (adjective) consisting of or having the hardness of adamant | - |
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| (adjective) having the hardness of a diamond | - |
| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, inexorable, intransigent |
| adducting | (adjective) especially of muscles; bringing together or drawing toward the midline of the body or toward an adjacent part | Synonyms: adducent, adductive |
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| adulterating | (adjective) making impure or corrupt by adding extraneous materials | Synonyms: adulterant |
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| adulting | (noun) acting like an adult | - |
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| affecting | (adjective) arousing affect | Synonyms: poignant, touching |
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| affectingly | (adverb) in a poignant or touching manner | Synonyms: poignantly, touchingly |
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| agglutinate | (adjective) united as if by glue | Synonyms: agglutinative |
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| (verb) clump together; as of bacteria, red blood cells, etc. | - |
| (verb) string together (morphemes in an agglutinating language) | - |
| agglutination | (noun) the building of words from component morphemes that retain their form and meaning in the process of combining | - |
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| (noun) a clumping of bacteria or red cells when held together by antibodies (agglutinins) | - |
| (noun) the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated | Synonyms: agglutinating activity |
| agglutinative | (adjective) united as if by glue | Synonyms: agglutinate |
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| (adjective) forming derivative or compound words by putting together constituents each of which expresses a single definite meaning | Synonyms: polysynthetic |
| agglutinin | (noun) an antibody that causes agglutination of a specific antigen | - |
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| agglutinogen | (noun) any substance that acts as an antigen to cause agglutinin production | - |
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| aggravating | (adjective) making worse | Synonyms: exacerbating, exasperating |
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| aggravatingly | (adverb) in an aggravating fashion | - |
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| agitating | (adjective) causing or tending to cause anger or resentment | Synonyms: agitative, provoking |
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| alerting | (noun) a warning serves to make you more alert to danger | Synonyms: alert |
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| (noun) a state of readiness to respond | Synonyms: alertness |
| alienating | (adjective) causing hostility or loss of friendliness | - |
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| alternating | (adjective) (of a current) reversing direction | - |
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| (adjective) occurring by turns; first one and then the other | Synonyms: alternate |
| ameliorating | (adjective) tending to ameliorate | Synonyms: ameliorative, amelioratory, meliorative |
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| amethystine | (adjective) containing or resembling amethyst | - |
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| andantino | (adjective) (of tempo) moderately fast | - |
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| animating | (adjective) giving spirit and vivacity | Synonyms: enlivening |
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| annihilating | (adjective) wreaking or capable of wreaking complete destruction | Synonyms: annihilative, devastating, withering |
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| (adjective) making light of | Synonyms: devastating, withering |
| annotating | (noun) the act of adding notes | Synonyms: annotation |
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| anointing | (noun) the act of applying oil or an oily liquid | Synonyms: anointment |
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| antineoplastic | (adjective) used in the treatment of cancer | Synonyms: anticancer, antitumor, antitumour |
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| (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 |
| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| antinode | (noun) (physics) the point of maximum displacement in a periodic system | - |
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| antinomasia | (noun) substitution of a title for a name | - |
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| antinomian | (adjective) relating to or influenced by antinomianism | - |
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| (noun) a follower of the doctrine of antinomianism | - |
| antinomianism | (noun) the theological doctrine that by faith and God's grace a Christian is freed from all laws (including the moral standards of the culture) | - |
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| antinomy | (noun) a contradiction between two statements that seem equally reasonable | - |
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| aquatint | (noun) a method of etching that imitates the broad washes of a water color | - |
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| (noun) an etching made by a process that makes it resemble a water color | - |
| (verb) etch in aquatint | - |
| argentine | (noun) any of various small silver-scaled salmon-like marine fishes | - |
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| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| arresting | (adjective) commanding attention | Synonyms: sensational, stunning |
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| asphyxiating | (adjective) tending to deprive of oxygen | - |
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| assenting | (adjective) expressing agreement or consent | Synonyms: assentient |
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| (noun) agreeing with or consenting to (often unwillingly) | Synonyms: accession |
| asserting | (adjective) relating to the use of or having the nature of a declaration | Synonyms: declarative, declaratory |
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| assimilating | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilative, assimilatory |
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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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| atorvastatin | (noun) an oral drug (trade name Lipitor) that is effective in lowering triglycerides; potent in reducing LDL cholesterol because higher doses can be given | Synonyms: Lipitor |
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| averting | (noun) the act of preventing something from occurring | - |
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| (noun) the act of turning yourself (or your gaze) away | Synonyms: aversion |
| azadirachtin | (noun) insecticide | - |
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| babbitting | (noun) lining a surface or bearing with Babbitt metal | - |
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| babysitting | (noun) the work of a baby sitter; caring for children when their parents are not home | Synonyms: baby sitting |
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| backlighting | (noun) lighting from behind | - |
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| baiting | (noun) harassment especially of a tethered animal | - |
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| balloting | (noun) a choice that is made by counting the number of people in favor of each alternative | Synonyms: ballot, vote, voting |
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| banqueting | (noun) eating an elaborate meal (often accompanied by entertainment) | Synonyms: feasting |
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| banting | (noun) wild ox of the Malay Archipelago | Synonyms: banteng, Bos banteng, tsine |
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| bareboating | (noun) boating by chartering a bareboat and providing your own crew and provisions | - |
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| bastinado | (noun) a form of torture in which the soles of the feet are beaten with whips or cudgels | Synonyms: falanga |
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| (noun) a cudgel used to give someone a beating on the soles of the feet | - |
| (verb) beat somebody on the soles of the feet | - |
| basting | (noun) moistening a roast as it is cooking | - |
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| (noun) a loose temporary sewing stitch to hold layers of fabric together | Synonyms: baste, basting stitch, tacking |
| batting | (noun) (baseball) the batter's attempt to get on base | - |
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| (noun) stuffing made of rolls or sheets of cotton wool or synthetic fiber | Synonyms: batten |
| beating | (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: drubbing, lacing, licking, thrashing, trouncing, whacking |
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| (noun) the act of overcoming or outdoing | Synonyms: whipping |