| aluminiferous | (adjective) containing alum or aluminum | - |
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| aluminise | (verb) cover with aluminum | Synonyms: aluminize |
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| aluminium | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminum, atomic number 13 |
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| aluminize | (verb) cover with aluminum | Synonyms: aluminise |
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| aluminous | (adjective) pertaining to or containing aluminum or alum | - |
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| aluminum | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminium, atomic number 13 |
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| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| amiability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiableness, bonhomie, geniality |
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| (noun) a cheerful and agreeable mood | Synonyms: good humor, good humour, good temper |
| amiable | (adjective) diffusing warmth and friendliness | Synonyms: affable, cordial, genial |
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| (adjective) disposed to please | Synonyms: good-humored, good-humoured |
| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| amiably | (adverb) in an affable manner | Synonyms: affably, genially |
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| amicability | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicableness |
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| (noun) a disinclination to quarrel | Synonyms: amicableness |
| amicable | (adjective) characterized by friendship and good will | - |
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| amicableness | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicability |
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| (noun) a disinclination to quarrel | Synonyms: amicability |
| amicably | (adverb) in an amicable manner | - |
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| amide | (noun) any organic compound containing the group -CONH2 | - |
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| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| amidship | (adjective) located in the middle part of a ship or aircraft | - |
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| (adverb) at or near or toward the center of a ship | Synonyms: amidships, midships |
| (adverb) at or near or toward the middle | - |
| amidships | (adverb) at or near or toward the center of a ship | Synonyms: amidship, midships |
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| amigo | (noun) a friend or comrade | - |
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| amine | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: aminoalkane |
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| aminic | (adjective) pertaining to or containing any of a group of organic compounds of nitrogen derived from ammonia | Synonyms: amino |
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| amino | (adjective) pertaining to or containing any of a group of organic compounds of nitrogen derived from ammonia | Synonyms: aminic |
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| (noun) the radical -NH2 | Synonyms: amino group |
| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| aminoalkane | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: amine |
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| aminobenzine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aniline, aniline oil, phenylamine |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| aminopherase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminotransferase, transaminase |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| aminoplast | (noun) a plastic (synthetic resin) made from amino compounds; used as an adhesive and as a coating for paper and textiles | Synonyms: amino plastic, amino resin |
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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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| aminotransferase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, transaminase |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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| amir | (noun) an independent ruler or chieftain (especially in Africa or Arabia) | Synonyms: ameer, emeer, emir |
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| amiss | (adjective) not functioning properly | Synonyms: awry, haywire, wrong |
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| (adverb) away from the correct or expected course | Synonyms: awry |
| (adverb) in an improper or mistaken or unfortunate manner | - |
| (adverb) in an imperfect or faulty way | Synonyms: imperfectly |
| amitosis | (noun) the direct method of cell division characterized by simple division of the nucleus without formation of chromosomes | - |
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| amitotic | (adjective) pertaining to a simple method of cell division | - |
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| amitriptyline | (noun) a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications | Synonyms: amitriptyline hydrochloride, Elavil |
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| amity | (noun) a cordial disposition | Synonyms: cordiality |
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| (noun) a state of friendship and cordiality | - |
| ammine | (noun) a complex inorganic compound that contains ammonia molecules | - |
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| ammino | (adjective) pertaining to or characteristic of an ammine (an inorganic coordination compound of ammonia and a metallic salt) | - |
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| amphetamine | (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: pep pill, speed, upper |
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| amphimixis | (noun) union of sperm and egg in sexual reproduction | - |
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| (noun) reproduction involving the union or fusion of a male and a female gamete | Synonyms: sexual reproduction |
| anaemia | (noun) a deficiency of red blood cells | Synonyms: anemia |
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| (noun) a lack of vitality | Synonyms: anemia |
| anaemic | (adjective) relating to anemia or suffering from anemia | Synonyms: anemic |
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| (adjective) lacking vigor or energy | Synonyms: anemic |
| analbuminemia | (noun) an abnormally low level of albumin in the blood serum | - |
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| anathemise | (verb) curse or declare to be evil or anathema or threaten with divine punishment | Synonyms: accurse, anathematise, anathematize, anathemize, comminate, execrate |
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| (verb) wish harm upon; invoke evil upon | Synonyms: anathemize, bedamn, beshrew, curse, damn, imprecate, maledict |
| anathemize | (verb) wish harm upon; invoke evil upon | Synonyms: anathemise, bedamn, beshrew, curse, damn, imprecate, maledict |
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| (verb) curse or declare to be evil or anathema or threaten with divine punishment | Synonyms: accurse, anathematise, anathematize, anathemise, comminate, execrate |
| anatomic | (adjective) of or relating to the structure of the body | Synonyms: anatomical |
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| (adjective) of or relating to the branch of morphology that studies the structure of organisms | Synonyms: anatomical |
| anatomical | (adjective) of or relating to the structure of the body | Synonyms: anatomic |
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| (adjective) of or relating to the branch of morphology that studies the structure of organisms | Synonyms: anatomic |
| (noun) an expression that relates to anatomy | Synonyms: anatomical reference |
| anatomically | (adverb) with respect to anatomy | - |
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| anatomise | (verb) dissect in order to analyze | Synonyms: anatomize |
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| anatomist | (noun) an expert in anatomy | - |
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| anatomize | (verb) analyze down to the smallest detail | - |
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| (verb) dissect in order to analyze | Synonyms: anatomise |
| andelmin | (noun) any of several tropical American trees of the genus Andira | Synonyms: angelim |
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| anemia | (noun) a deficiency of red blood cells | Synonyms: anaemia |
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| (noun) a lack of vitality | Synonyms: anaemia |
| anemic | (adjective) relating to anemia or suffering from anemia | Synonyms: anaemic |
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| (adjective) lacking vigor or energy | Synonyms: anaemic |
| animise | (verb) give lifelike qualities to | Synonyms: animate, animize |
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| animism | (noun) the doctrine that all natural objects and the universe itself have souls | - |
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| animist | (adjective) of or pertaining to the doctrine of animism | Synonyms: animistic |
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| (noun) one who accepts the doctrine of animism | - |
| animistic | (adjective) of or pertaining to the doctrine of animism | Synonyms: animist |
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| animize | (verb) give lifelike qualities to | Synonyms: animate, animise |
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| anisogamic | (adjective) relating to a type of sexual reproduction in which the gametes are dissimilar in some respect (as size or shape) | Synonyms: anisogamous |
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| anomia | (noun) inability to name objects or to recognize written or spoken names of objects | Synonyms: amnesic aphasia, amnestic aphasia, anomic aphasia, nominal aphasia |
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| anomic | (adjective) socially disoriented | Synonyms: alienated, disoriented |
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| anomie | (noun) lack of moral standards in a society | Synonyms: anomy |
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| (noun) personal state of isolation and anxiety resulting from a lack of social control and regulation | Synonyms: anomy |
| anonymity | (noun) the state of being anonymous | Synonyms: namelessness |
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| anorgasmia | (noun) absence of an orgasm in sexual relations | - |
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| anosmia | (noun) absence of the sense of smell (as by damage to olfactory nasal tissue or the olfactory nerve or by obstruction of the nasal passages) | - |
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| anosmic | (adjective) relating to an impairment or loss of the sense of smell | Synonyms: anosmatic |
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| (adjective) having impaired sense of smell | - |
| anoxemia | (noun) abnormally low oxygen content in arterial blood | - |
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| anoxemic | (adjective) relating to or marked by abnormally little oxygen in arterial blood | - |
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| anthelminthic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelmintic, helminthic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
| anthelmintic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelminthic, helminthic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
| antiarrhythmic | (noun) a drug used to treat an abnormal heart rhythm | Synonyms: antiarrhythmic drug, antiarrhythmic medication |
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| antidromic | (adjective) conducting nerve impulses in a direction opposite to normal | - |
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| antifeminism | (noun) activity indicative of belief in the superiority of men over women | Synonyms: chauvinism, male chauvinism |
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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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| antimicrobial | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobic |
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| (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
| antimicrobic | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobial |
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| (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, disinfectant, germicide |
| 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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| antisemitic | (adjective) relating to or characterized by anti-Semitism; hating Jews | Synonyms: anti-semitic |
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| antisemitism | (noun) the intense dislike for and prejudice against Jewish people | Synonyms: anti-Semitism |
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| apogamic | (adjective) of or relating to the development of an embryo in the absence of fertilization | Synonyms: apogametic, apogamous |
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| apolemia | (noun) large siphonophore of up to 50 ft long | - |
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| apomict | (noun) a plant that reproduces or is reproduced by apomixis | - |
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| apomictic | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictical |
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| (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamogenetic, agamous, parthenogenetic |
| apomictical | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictic |
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| apomixis | (noun) any of several kinds of reproduction without fertilization | - |
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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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| arcminute | (noun) a unit of angular distance equal to a 60th of a degree | Synonyms: minute, minute of arc |
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| armiger | (noun) a squire carrying the armor of a knight | Synonyms: armor-bearer |
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| (noun) a nobleman entitled to bear heraldic arms | - |
| armilla | (noun) (archeology) a bracelet worn around the wrist or arm | - |
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| (noun) a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars | Synonyms: armillary sphere |
| armillary | (adjective) of or relating to bracelets | - |
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| arming | (noun) the act of equipping with weapons in preparation for war | Synonyms: armament, equipping |
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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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| arrhythmia | (noun) an abnormal rate of muscle contractions in the heart | Synonyms: cardiac arrhythmia |
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| arrhythmic | (adjective) without regard for rhythm | Synonyms: arrhythmical |
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| (adjective) lacking a steady rhythm | Synonyms: jerking, jerky |