| abhorrence | (noun) hate coupled with disgust | Synonyms: abomination, detestation, execration, loathing, odium |
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| abhorrer | (noun) a signer of a 1679 address to Charles II in which those who petitioned for the reconvening of parliament were condemned and abhorred | - |
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| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| acanthocyte | (noun) an abnormal red blood cell that has thorny projections of protoplasm | - |
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| acanthocytosis | (noun) the presence of acanthocytes in the blood stream (as in abetalipoproteinemia) | - |
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| acantholysis | (noun) a breakdown of a cell layer in the epidermis (as in pemphigus) | - |
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| acanthoma | (noun) a neoplasm originating in the epidermis | Synonyms: skin tumor |
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| acanthopterygian | (noun) a teleost fish with fins that are supported by sharp inflexible rays | Synonyms: spiny-finned fish |
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| acanthosis | (noun) an abnormal but benign thickening of the prickle-cell layer of the skin (as in psoriasis) | - |
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| acarophobia | (noun) a morbid fear of small insects and mites and worms | - |
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| acetylcholine | (noun) a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems | - |
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| acholia | (noun) a condition in which little or no bile is secreted or the flow of bile into the digestive tract is obstructed | Synonyms: cholestasis |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| acousticophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: phonophobia |
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| acrophobia | (noun) a morbid fear of great heights | - |
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| acrophony | (noun) naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter | - |
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| adhocracy | (noun) an organization with little or no structure | - |
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| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| adulthood | (noun) the state (and responsibilities) of a person who has attained maturity | - |
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| (noun) the period of time in your life after your physical growth has stopped and you are fully developed | Synonyms: maturity |
| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agraphon | (noun) (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings. | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| alcohol | (noun) a liquor or brew containing alcohol as the active agent | Synonyms: alcoholic beverage, alcoholic drink, inebriant, intoxicant |
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| (noun) any of a series of volatile hydroxyl compounds that are made from hydrocarbons by distillation | - |
| alcoholic | (noun) a person who drinks alcohol to excess habitually | Synonyms: alky, boozer, dipsomaniac, lush, soaker, souse |
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| alcoholism | (noun) an intense persistent desire to drink alcoholic beverages to excess | Synonyms: dipsomania, potomania |
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| (noun) habitual intoxication; prolonged and excessive intake of alcoholic drinks leading to a breakdown in health and an addiction to alcohol such that abrupt deprivation leads to severe withdrawal symptoms | Synonyms: alcohol addiction, drunkenness, inebriation |
| alehoof | (noun) trailing European aromatic plant of the mint family having rounded leaves and small purplish flowers often grown in hanging baskets; naturalized in North America; sometimes placed in genus Nepeta | Synonyms: field balm, gill-over-the-ground, Glechoma hederaceae, ground ivy, Nepeta hederaceae, runaway robin |
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| alehouse | (noun) a tavern where ale is sold | - |
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| algophobia | (noun) a morbid fear of pain | - |
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| allophone | (noun) (linguistics) any of various acoustically different forms of the same phoneme | - |
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| amenorrhoea | (noun) absence or suppression of normal menstrual flow | Synonyms: amenia, amenorrhea |
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| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| ampholyte | (noun) A substance that acts as a base or an acid, depending on the pH of the solution into which it is introduced. | Synonyms: amphoteric electrolyte |
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| amphora | (noun) an ancient jar with two handles and a narrow neck; used to hold oil or wine | - |
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| amphotericin | (noun) an antibiotic and antifungal agent | - |
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| anacoluthon | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthia |
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| anamorphosis | (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: anamorphism |
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| (noun) the evolution of one type of organism from another by a long series of gradual changes | Synonyms: anamorphism |
| anaphor | (noun) a word (such as a pronoun) used to avoid repetition; the referent of an anaphor is determined by its antecedent | - |
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| anaphora | (noun) using a pronoun or similar word instead of repeating a word used earlier | - |
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| (noun) repetition of a word or phrase at the beginning of successive clauses | Synonyms: epanaphora |
| anchor | (noun) a mechanical device that prevents a vessel from moving | Synonyms: ground tackle |
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| (noun) a central cohesive source of support and stability | Synonyms: backbone, keystone, linchpin, lynchpin, mainstay |
| (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchorman, anchorperson |
| anchorage | (noun) the act of anchoring | - |
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| (noun) place for vessels to anchor | Synonyms: anchorage ground |
| (noun) a fee for anchoring | - |
| (noun) the condition of being secured to a base | - |
| (noun) the provision of a sense of security or steadfastness | - |
| anchorite | (noun) one retired from society for religious reasons | Synonyms: hermit |
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| anchorman | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorperson |
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| anchorperson | (noun) a television reporter who coordinates a broadcast to which several correspondents contribute | Synonyms: anchor, anchorman |
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| anchovy | (noun) small herring-like plankton-eating fishes often canned whole or as paste; abundant in tropical waters worldwide | - |
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| (noun) tiny fishes usually canned or salted; used for hors d'oeuvres or as seasoning in sauces | - |
| androphobia | (noun) a morbid fear of men | - |
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| anethole | (noun) an organic compound that is widely used as a flavoring substance. | Synonyms: anise camphor |
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| anglophobe | (noun) a person who hates England and everything English | - |
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| anorthography | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: agraphia, logagraphia |
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| anorthopia | (noun) distorted vision in which straight lines appear curved | - |
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| antheridiophore | (noun) gametophore bearing antheridia as in certain mosses and liverworts | - |
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| anthologist | (noun) an editor who makes selections for an anthology | - |
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| anthology | (noun) a collection of selected literary passages | - |
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| anthophyllite | (noun) a dark brown mineral of the amphibole group; magnesium iron silicate | - |
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| anthozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: actinozoan |
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| anticholinergic | (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
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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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| antiphon | (noun) a verse or song to be chanted or sung in response | Synonyms: antiphony |
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| antiphonal | (noun) bound collection of antiphons | Synonyms: antiphonary |
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| antiphonary | (noun) bound collection of antiphons | Synonyms: antiphonal |
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| antiphony | (noun) alternate (responsive) singing by a choir in two parts | - |
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| (noun) a verse or song to be chanted or sung in response | Synonyms: antiphon |
| antipsychotic | (noun) tranquilizer used to treat psychotic conditions when a calming effect is desired | Synonyms: antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug |
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| aphonia | (noun) a disorder of the vocal organs that results in the loss of voice | Synonyms: voicelessness |
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| aphorism | (noun) a short pithy instructive saying | Synonyms: apophthegm, apothegm |
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| aphorist | (noun) someone who formulates aphorisms or who repeats aphorisms | - |
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| aplacophoran | (noun) deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle | Synonyms: solenogaster |
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| aquaphobia | (noun) a morbid fear of drowning | - |
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| arachnophobia | (noun) a morbid fear of spiders | - |
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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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| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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| armhole | (noun) a hole through which you put your arm and where a sleeve can be attached | - |
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| arsehole | (noun) vulgar slang for anus | Synonyms: arse, asshole, bunghole |
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| artichoke | (noun) a thistlelike flower head with edible fleshy leaves and heart | Synonyms: globe artichoke |
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| (noun) Mediterranean thistlelike plant widely cultivated for its large edible flower head | Synonyms: artichoke plant, Cynara scolymus, globe artichoke |
| asphodel | (noun) any of various chiefly Mediterranean plants of the genera Asphodeline and Asphodelus having linear leaves and racemes of white or pink or yellow flowers | - |
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| asshole | (noun) vulgar slang for anus | Synonyms: arse, arsehole, bunghole |
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| (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: bastard, cocksucker, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch, whoreson |
| astraphobia | (noun) a morbid fear of thunder and lightning | - |
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| athodyd | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: atherodyde, flying drainpipe, ramjet, ramjet engine |
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| author | (noun) writes (books or stories or articles or the like) professionally (for pay) | Synonyms: writer |
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| (noun) someone who originates or causes or initiates something | Synonyms: generator, source |
| authoress | (noun) a woman author | - |
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| 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 |
| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authoritarian | (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
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| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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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 |
| autochthon | (noun) the earliest known inhabitants of a region | - |
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| autochthony | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: endemism, indigenousness |
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| automysophobia | (noun) a morbid fear of being dirty | - |
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| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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| babyhood | (noun) the earliest state of immaturity | Synonyms: infancy |
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| (noun) the early stage of growth or development | Synonyms: early childhood, infancy |
| bachelorhood | (noun) the state of being an unmarried man | - |
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| (noun) the time of a man's life prior to marriage | - |