| asthma | (noun) respiratory disorder characterized by wheezing; usually of allergic origin | Synonyms: asthma attack, bronchial asthma |
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| asthmatic | (adjective) relating to breathing with a whistling sound | Synonyms: wheezing, wheezy |
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| (noun) a person suffering from asthma | - |
| astigmatic | (adjective) of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images | - |
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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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| astir | (adjective) on the move | Synonyms: about |
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| (adjective) out of bed | Synonyms: up |
| astomatal | (adjective) lacking a stoma or stomata | - |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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| astonied | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonished, astounded, stunned |
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| astonish | (verb) affect with wonder | Synonyms: amaze, astound |
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| astonished | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astounded, stunned |
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| astonishing | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astounding, staggering, stupefying |
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| (adjective) surprising greatly | Synonyms: amazing |
| astonishingly | (adverb) in an amazing manner; to everyone's surprise | Synonyms: amazingly, surprisingly |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astound | (verb) affect with wonder | Synonyms: amaze, astonish |
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| astounded | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astonished, stunned |
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| astounding | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astonishing, staggering, stupefying |
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| (adjective) bewildering or striking dumb with wonder | Synonyms: dumbfounding, dumfounding |
| astraddle | (adverb) with one leg on each side | Synonyms: astride |
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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 |
| astragalar | (adjective) of or relating to the anklebone | - |
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| 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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| astral | (adjective) being or relating to or resembling or emanating from stars | Synonyms: stellar |
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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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| astray | (adverb) away from the right path or direction | - |
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| (adverb) far from the intended target | Synonyms: wide |
| astride | (adverb) with one leg on each side | Synonyms: astraddle |
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| (adverb) with the legs stretched far apart | - |
| astringe | (verb) become constricted or compressed | - |
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| (verb) constrict or bind or draw together | - |
| astringence | (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringency |
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| astringency | (noun) the ability to contract or draw together soft body tissues to check blood flow or restrict secretion of fluids | Synonyms: stypsis |
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| (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringence |
| astringent | (adjective) tending to draw together or constrict soft organic tissue | - |
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| (adjective) sour or bitter in taste | Synonyms: acerb, acerbic |
| (noun) a drug that causes contraction of body tissues and canals | Synonyms: astringent drug, styptic |
| astrobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: exobiology, space biology |
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| astrocyte | (noun) comparatively large neuroglial cell | - |
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| astrocytic | (adjective) of or relating to or containing large star-shaped cells in the neuroglia | - |
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| astrodome | (noun) a transparent dome on top of an airplane where the navigator can make celestial observations | - |
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| astrodynamics | (noun) the branch of astronomy that studies the motion of natural and artificial bodies in space | - |
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| astrogate | (verb) navigate in space | - |
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| (verb) guide in interplanetary travel | - |
| astrogator | (noun) the navigator of a spacecraft | - |
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| astroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: macroglia |
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| astrolabe | (noun) an early form of sextant | - |
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| astrolatry | (noun) the worship of planets or stars | Synonyms: worship of heavenly bodies |
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| astrologer | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologist |
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| astrological | (adjective) relating to or concerned with astrology | - |
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| astrologist | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologer |
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| astrology | (noun) a pseudoscience claiming divination by the positions of the planets and sun and moon | Synonyms: star divination |
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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| astronautic | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautical |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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| astronavigation | (noun) navigating according to the positions of the stars | Synonyms: celestial navigation |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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| astronomic | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomical |
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| (adjective) inconceivably large | Synonyms: astronomical, galactic |
| astronomical | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomic |
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| (adjective) inconceivably large | Synonyms: astronomic, galactic |
| astronomically | (adverb) enormously | - |
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| astronomy | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: uranology |
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| astrophysical | (adjective) of or concerned with astrophysics | - |
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| astrophysicist | (noun) an astronomer who studies the physical properties of celestial bodies | - |
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| astrophysics | (noun) the branch of astronomy concerned with the physical and chemical properties of celestial bodies | - |
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| astute | (adjective) marked by practical hardheaded intelligence | Synonyms: sharp, shrewd |
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| astutely | (adverb) in a shrewd manner | Synonyms: acutely, sagaciously, sapiently, shrewdly |
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| astuteness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: perspicaciousness, perspicacity, shrewdness |
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| (noun) the intellectual ability to penetrate deeply into ideas | Synonyms: deepness, depth, profoundness, profundity |
| astylar | (adjective) lacking columns or pillars | - |
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| asystole | (noun) absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death | Synonyms: cardiac arrest, cardiopulmonary arrest |
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| atavist | (noun) an organism that has the characteristics of a more primitive type of that organism | Synonyms: throwback |
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| atavistic | (adjective) characteristic of an atavist | Synonyms: throwback |
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| atheist | (adjective) related to or characterized by or given to atheism | Synonyms: atheistic, atheistical |
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| (noun) someone who does not believe in the existence of a god | - |
| atheistic | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistical |
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| (adjective) rejecting any belief in gods | Synonyms: atheistical, unbelieving |
| atheistical | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistic |
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| (adjective) rejecting any belief in gods | Synonyms: atheistic, unbelieving |
| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| atomistic | (adjective) divided into separate and often disparate elements | Synonyms: atomistical |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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| atonalistic | (adjective) of or relating to atonalism | - |
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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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| attest | (verb) authenticate, affirm to be true, genuine, or correct, as in an official capacity | - |
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| (verb) provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes | Synonyms: certify, demonstrate, evidence, manifest |
| (verb) give testimony in a court of law | Synonyms: bear witness, take the stand, testify |
| (verb) establish or verify the usage of | - |
| attestant | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestator, attestor, witness |
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| (noun) someone who affirms or vouches for the correctness or truth or genuineness of something | Synonyms: attester |
| attestation | (noun) the action of bearing witness | - |
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| (noun) the evidence by which something is attested | - |
| attestator | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestor, witness |
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| attested | (adjective) established as genuine | Synonyms: authenticated, documented |
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| attester | (noun) someone who affirms or vouches for the correctness or truth or genuineness of something | Synonyms: attestant |
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| attestor | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestator, witness |
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| august | (adjective) profoundly honored | Synonyms: revered, venerable |
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| (adjective) of or befitting a lord | Synonyms: grand, lordly |
| austenite | (noun) a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite | - |
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| austenitic | (adjective) composed of austenite | - |
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| austere | (adjective) practicing great self-denial | Synonyms: ascetic, ascetical, spartan |
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| (adjective) of a stern or strict bearing or demeanor; forbidding in aspect | Synonyms: stern |
| (adjective) severely simple | Synonyms: severe, stark, stern |
| austerely | (adverb) in an austere fashion | - |
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| austereness | (noun) extreme plainness | Synonyms: severeness, severity |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| austral | (adjective) of the south or coming from the south | - |
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| (noun) the basic unit of money in Argentina; equal to 100 centavos | - |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| autistic | (adjective) characteristic of or affected with autism | - |
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| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| autostereotype | (noun) the standardized mental picture held in common by members of a cultural group depicting an oversimplified image of themselves and their behaviour. | - |
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| autostrada | (noun) an expressway in an Italian-speaking country | - |
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| autosuggestion | (noun) a system for self-improvement developed by Emile Coue which was popular in the 1920s and 1930s | Synonyms: auto-suggestion, self-suggestion |
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| avifaunistic | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunal |
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| awestricken | (adjective) having or showing a feeling of mixed reverence and respect and wonder and dread | Synonyms: awed, awestruck |
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