| abomasal | (adjective) relating to the abomasum (the fourth compartment of the stomach of ruminants) | - |
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| abscissa | (noun) the value of a coordinate on the horizontal axis | - |
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| absolutisation | (noun) the process of rendering something absolute or converting it into an absolute. | Synonyms: absolutization |
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| abyssal | (adjective) relating to ocean depths from 2000 to 5000 meters | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, unfathomable |
| accessary | (adjective) aiding and abetting in a crime | Synonyms: accessory |
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| (noun) someone who helps another person commit a crime | Synonyms: accessory |
| acclimatisation | (noun) adaptation to a new climate (a new temperature or altitude or environment) | Synonyms: acclimation, acclimatization |
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| accusal | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusation |
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| accusation | (noun) a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt | Synonyms: accusal |
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| (noun) an assertion that someone is guilty of a fault or offence | Synonyms: charge |
| accusative | (adjective) serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes | Synonyms: objective |
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| (adjective) containing or expressing accusation | Synonyms: accusatory, accusing, accusive |
| (noun) the case of nouns serving as the direct object of a verb | Synonyms: accusative case, objective case |
| accusatorial | (adjective) specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor | - |
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| accusatory | (adjective) containing or expressing accusation | Synonyms: accusative, accusing, accusive |
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| actualisation | (noun) making real or giving the appearance of reality | Synonyms: actualization, realisation, realization |
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| addressable | (adjective) capable of being addressed | - |
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| adenomyosarcoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: embryoma of the kidney, nephroblastoma, Wilms' tumor, Wilms tumour |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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| adversative | (adjective) expressing antithesis or opposition | Synonyms: oppositive |
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| advisability | (noun) the quality of being advisable | - |
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| advisable | (adjective) worthy of being recommended or suggested; prudent or wise | - |
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| aforesaid | (adjective) being the one previously mentioned or spoken of | Synonyms: aforementioned, said |
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| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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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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| allosaur | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaurus |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alsatian | (noun) breed of large shepherd dogs used in police work and as a guide for the blind | Synonyms: German police dog, German shepherd, German shepherd dog |
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| ambassador | (noun) a diplomat of the highest rank; accredited as representative from one country to another | Synonyms: embassador |
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| (noun) an informal representative | - |
| ambassadorial | (adjective) of or relating to or characteristic of ambassadors | - |
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| ambassadorship | (noun) the post of ambassador | - |
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| ambassadress | (noun) a woman ambassador | - |
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| amortisation | (noun) payment of an obligation in a series of installments or transfers | Synonyms: amortization |
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| (noun) the reduction of the value of an asset by prorating its cost over a period of years | Synonyms: amortization |
| ampersand | (noun) a punctuation mark (&) used to represent conjunction (and) | - |
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| analysand | (noun) a person undergoing psychoanalysis | - |
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| anasarca | (noun) generalized edema with accumulation of serum in subcutaneous connective tissue | - |
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| anasarcous | (adjective) characterized by or affected by dropsy | - |
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| anathematisation | (noun) the formal act of pronouncing (someone or something) accursed | Synonyms: anathematization |
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| anchusa | (noun) any of various Old World herbs of the genus Anchusa having one-sided clusters of trumpet-shaped flowers | - |
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| angiosarcoma | (noun) a rare malignant neoplasm arising from vascular tissue; usually occurs in the breast and skin and is believed to originate from the endothelial cells of blood vessels | - |
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| animalisation | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalization, brutalisation, brutalization |
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| ankylosaur | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaurus |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| anniversary | (noun) the date on which an event occurred in some previous year (or the celebration of it) | Synonyms: day of remembrance |
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| anticonvulsant | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant drug, antiepileptic, antiepileptic drug |
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| antidepressant | (noun) any of a class of drugs used to treat depression; often have undesirable side effects | Synonyms: antidepressant drug |
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| antimacassar | (noun) a piece of ornamented cloth that protects the back of a chair from hair oils | - |
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| antisatellite | (adjective) of or relating to a system to destroy satellites in orbit | Synonyms: ASAT |
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| apatosaur | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaurus, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| appeasable | (adjective) capable of being pacified | Synonyms: conciliable |
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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 |
| apposable | (adjective) capable of being placed opposite to something | Synonyms: opposable |
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| 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 |
| apprisal | (noun) informing by words | Synonyms: notification, telling |
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| archdiocesan | (adjective) of or relating to an archdiocese | - |
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| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| arousal | (noun) the act of arousing | Synonyms: rousing |
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| (noun) mutual sexual fondling prior to sexual intercourse | Synonyms: foreplay, stimulation |
| (noun) awakening from sleep | - |
| (noun) a state of heightened physiological activity | - |
| artisan | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artificer, craftsman, journeyman |
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| asafetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafoetida |
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| asafoetida | (noun) the brownish gum resin of various plants; has strong taste and odor; formerly used as an antispasmodic | Synonyms: asafetida |
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| asana | (noun) (Hinduism) a posture or manner of sitting (as in the practice of yoga) | - |
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| asarabacca | (noun) thick creeping evergreen herb of western Europe | Synonyms: Asarum europaeum |
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| assagai | (noun) the slender spear of the Bantu-speaking people of Africa | Synonyms: assegai |
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| assail | (verb) attack in speech or writing | Synonyms: assault, attack, lash out, round, snipe |
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| (verb) attack someone physically or emotionally | Synonyms: assault, attack, set on |
| (verb) launch an attack or assault on; begin hostilities or start warfare with | Synonyms: attack |
| assailability | (noun) vulnerability to forceful attack | - |
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| assailable | (adjective) not defended or capable of being defended | Synonyms: open, undefendable, undefended |
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| assailant | (noun) someone who attacks | Synonyms: aggressor, assaulter, attacker |
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| assassin | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassinator, bravo |
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| (noun) a member of a secret order of Muslims (founded in the 12th century) who terrorized and killed Christian Crusaders | - |
| assassinate | (verb) destroy or damage seriously, as of someone's reputation | - |
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| (verb) murder; especially of socially prominent persons | - |
| assassinated | (adjective) murdered by surprise attack for political reasons | - |
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| assassination | (noun) murder of a public figure by surprise attack | - |
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| (noun) an attack intended to ruin someone's reputation | Synonyms: blackwash, character assassination |
| assassinator | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassin, bravo |
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| assault | (noun) close fighting during the culmination of a military attack | - |
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| (noun) a threatened or attempted physical attack by someone who appears to be able to cause bodily harm if not stopped | - |
| (noun) the crime of forcing a person to submit to sexual intercourse against his or her will | Synonyms: rape, ravishment, violation |
| (verb) attack in speech or writing | Synonyms: assail, attack, lash out, round, snipe |
| (verb) attack someone physically or emotionally | Synonyms: assail, attack, set on |
| (verb) force (someone) to have sex against their will | Synonyms: dishonor, dishonour, outrage, rape, ravish, violate |
| assaulter | (noun) someone who attacks | Synonyms: aggressor, assailant, attacker |
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| assaultive | (adjective) disposed to attack | Synonyms: attacking |
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| assay | (noun) a quantitative or qualitative test of a substance (especially an ore or a drug) to determine its components; frequently used to test for the presence or concentration of infectious agents or antibodies etc. | - |
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| (noun) an appraisal of the state of affairs | Synonyms: check |
| (noun) a written report of the results of an analysis of the composition of some substance | - |
| (noun) a substance that is undergoing an analysis of its components | - |
| (verb) analyze (chemical substances) | - |
| (verb) make an effort or attempt | Synonyms: attempt, essay, seek, try |
| assayer | (noun) an analyst who assays (performs chemical tests on) metals | - |
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| assessable | (adjective) capable of being considered carefully | - |
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| (adjective) capable of being assessed especially for the purpose of taxation | - |
| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| babiroussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babirusa, babirussa, Babyrousa Babyrussa |
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| babirusa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirussa, Babyrousa Babyrussa |
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| babirussa | (noun) Indonesian wild pig with enormous curved canine teeth | Synonyms: babiroussa, babirusa, Babyrousa Babyrussa |
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| backsaw | (noun) a handsaw that is stiffened by metal reinforcement along the upper edge | Synonyms: back saw |
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| baisa | (noun) 1,000 baiza equal 1 riyal-omani in Oman | Synonyms: baiza |
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| balsa | (noun) forest tree of lowland Central America having a strong very light wood; used for making floats and rafts and in crafts | Synonyms: Ochroma lagopus |
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| (noun) strong lightweight wood of the balsa tree used especially for floats | Synonyms: balsa wood |
| balsam | (noun) an ointment containing a fragrant resin | - |
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| (noun) any seed plant yielding balsam | - |
| (noun) any of various fragrant oleoresins used in medicines and perfumes | - |
| balsamic | (adjective) of or relating to or containing balsam | Synonyms: balsamy |
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| balsamroot | (noun) a plant of the genus Balsamorhiza having downy leaves in a basal rosette and yellow flowers and long balsam-scented taproots | - |
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| balsamy | (adjective) of or relating to or containing balsam | Synonyms: balsamic |
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| bandsaw | (noun) an endless saw consisting of a toothed metal band that is driven around two wheels | Synonyms: band saw |
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| barbarisation | (noun) an act that makes people primitive and uncivilized | Synonyms: barbarization |
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| barosaur | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaurus |
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| barosaurus | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaur |
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| basal | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: radical |
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| (adjective) serving as or forming a base | Synonyms: base |
| (adjective) of or being the essential or basic part | Synonyms: elemental, elementary, primary |
| basalt | (noun) the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene | - |
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| basaltic | (adjective) of or relating to or containing basalt | - |
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| bassarisk | (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, cacomistle, cacomixle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat, ringtail |
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| bastardisation | (noun) an act that debases or corrupts | Synonyms: bastardization |
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