| acapnia | (noun) a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing | Synonyms: hypocapnia |
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| acapnial | (adjective) relating to or demonstrating acapnia | Synonyms: acapnic, acapnotic |
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| acapnic | (adjective) relating to or demonstrating acapnia | Synonyms: acapnial, acapnotic |
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| acapnotic | (adjective) relating to or demonstrating acapnia | Synonyms: acapnial, acapnic |
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| acataphasia | (noun) a disorder in which a lesion to the central nervous system leaves you unable to formulate a statement or to express yourself in an organized manner | - |
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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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| adapt | (verb) make fit for, or change to suit a new purpose | Synonyms: accommodate |
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| (verb) adapt or conform oneself to new or different conditions | Synonyms: adjust, conform |
| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| adaptable | (adjective) capable of adapting (of becoming or being made suitable) to a particular situation or use | - |
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| adaptation | (noun) (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) | - |
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| (noun) a written work (as a novel) that has been recast in a new form | Synonyms: version |
| (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaption, adjustment |
| adaptational | (adjective) of or relating to adaptation | - |
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| adaptative | (adjective) having a capacity for adaptation | Synonyms: adaptive |
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| adapted | (adjective) changed in order to improve or made more fit for a particular purpose | Synonyms: altered |
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| adapter | (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible | Synonyms: adaptor |
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| (noun) a musician who adapts a composition for particular voices or instruments or for another style of performance | Synonyms: arranger, transcriber |
| adaption | (noun) the process of adapting to something (such as environmental conditions) | Synonyms: adaptation, adjustment |
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| adaptive | (adjective) having a capacity for adaptation | Synonyms: adaptative |
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| adaptor | (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible | Synonyms: adapter |
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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. | - |
| adoxography | (noun) fine writing in praise of trivial or base subjects | - |
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| aesculapian | (adjective) of or belonging to Aesculapius or the healing art | Synonyms: medical |
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| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| agape | (adjective) with the mouth wide open as in wonder or awe | Synonyms: gaping |
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| (noun) a religious meal shared as a sign of love and fellowship | Synonyms: love feast |
| (noun) selfless love of one person for another without sexual implications (especially love that is spiritual in nature) | Synonyms: agape love |
| (noun) (Christian theology) the love of God or Christ for mankind | - |
| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agoraphobic | (adjective) suffering from agoraphobia; abnormally afraid of open or public places | - |
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| agrapha | (noun) sayings of Jesus not recorded in the canonical Gospels | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| agraphic | (adjective) relating to or having agraphia | - |
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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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| alcapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alkapton, homogentisic acid |
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| alcaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alkaptonuria |
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| alkapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alcapton, homogentisic acid |
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| alkaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alcaptonuria |
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| allograph | (noun) a variant form of a grapheme, as `m' or `M' or a handwritten version of that grapheme | - |
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| (noun) a signature written by one person for another | - |
| allographic | (adjective) of or relating to an allograph | - |
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| anapaest | (noun) a metrical unit with unstressed-unstressed-stressed syllables | Synonyms: anapest |
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| anapaestic | (adjective) (of a metric foot) characterized by two short syllables followed by a long one | Synonyms: anapestic |
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| anapest | (noun) a metrical unit with unstressed-unstressed-stressed syllables | Synonyms: anapaest |
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| anapestic | (adjective) (of a metric foot) characterized by two short syllables followed by a long one | Synonyms: anapaestic |
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| anaphase | (noun) the stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle | - |
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| anaphasic | (adjective) of or related to the stage of mitosis known as anaphase | - |
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| 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 |
| anaphoric | (adjective) relating to anaphora | - |
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| anaphrodisia | (noun) decline or absence of sexual desire | - |
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| anaphrodisiac | (adjective) tending to diminish sexual desire | - |
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| anaphylactic | (adjective) related to the hypersensitivity known as anaphylaxis | - |
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| anaphylaxis | (noun) hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance | - |
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| anaplasia | (noun) loss of structural differentiation within a cell or group of cells often with increased capacity for multiplication, as in a malignant tumor | - |
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| anaplasmosis | (noun) a disease of cattle that is transmitted by cattle ticks; similar to Texas fever | - |
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| anaplastic | (adjective) of or relating to anaplasia | - |
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| anaplasty | (noun) surgery concerned with therapeutic or cosmetic reformation of tissue | Synonyms: plastic surgery, reconstructive surgery |
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| anapsid | (noun) primitive reptile having no opening in the temporal region of the skull; all extinct except turtles | Synonyms: anapsid reptile |
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| anemograph | (noun) An instrument which records wind velocities. | - |
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| anemographic | (adjective) pertaining to the recording of wind measurements | - |
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| anemography | (noun) recording anemometrical measurements | - |
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| angiography | (noun) roentgenographic examination of blood vessels after injection of a radiopaque contrast medium; produces an angiogram | - |
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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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| antapex | (noun) the point opposite in direction from the solar apex; the point the solar system is moving away from | - |
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| antiapartheid | (adjective) opposing the policy of apartheid in South Africa | - |
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| apace | (adverb) with speed | Synonyms: chop-chop, in short order, quickly, rapidly, speedily |
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| (adverb) (poetic, literary) quickly | - |
| apache | (noun) a Parisian gangster | - |
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| apadana | (noun) the great hall in ancient Persian palaces | - |
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| apanage | (noun) a grant (by a sovereign or a legislative body) of resources to maintain a dependent member of a ruling family | Synonyms: appanage |
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| (noun) any customary and rightful perquisite appropriate to your station in life | Synonyms: appanage |
| apar | (noun) South American armadillo with three bands of bony plates | Synonyms: three-banded armadillo, Tolypeutes tricinctus |
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| apart | (adjective) having characteristics not shared by others | - |
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| (adjective) remote and separate physically or socially | Synonyms: isolated, obscure |
| (adverb) not taken into account or excluded from consideration | Synonyms: aside |
| (adverb) into parts or pieces | Synonyms: asunder |
| (adverb) separated or at a distance in place or position or time | - |
| (adverb) one from the other | - |
| (adverb) placed or kept separate and distinct as for a purpose | Synonyms: aside |
| (adverb) away from another or others | - |
| apartheid | (noun) a social policy or racial segregation involving political and economic and legal discrimination against people who are not Whites; the former official policy in South Africa | - |
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| apartment | (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: flat |
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| apathetic | (adjective) showing little or no emotion or animation | - |
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| (adjective) marked by a lack of interest | Synonyms: indifferent |
| apathetically | (adverb) in an apathetic manner | - |
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| apathy | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: indifference, numbness, spiritlessness |
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| (noun) an absence of emotion or enthusiasm | - |
| apatite | (noun) a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus | - |
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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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| ape | (noun) any of various primates with short tails or no tail at all | - |
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| (noun) person who resembles a nonhuman primate | Synonyms: anthropoid |
| (noun) someone who copies the words or behavior of another | Synonyms: aper, copycat, emulator, imitator |
| (verb) represent in or produce a caricature of | Synonyms: caricature |
| (verb) imitate uncritically and in every aspect | - |
| apelike | (adjective) being or given to servile imitation | Synonyms: apish |
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| (adjective) resembling apes | Synonyms: anthropoid, anthropoidal |
| aper | (noun) someone who copies the words or behavior of another | Synonyms: ape, copycat, emulator, imitator |
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| apercu | (noun) a short synopsis | - |
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| aperea | (noun) South American cavy; possibly ancestral to the domestic guinea pig | Synonyms: Cavia porcellus, wild cavy |
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| aperient | (adjective) mildly laxative | - |
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| (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: cathartic, physic, purgative |
| aperiodic | (adjective) not recurring at regular intervals | Synonyms: nonperiodic |
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| aperitif | (noun) alcoholic beverage taken before a meal as an appetizer | - |
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| aperture | (noun) an man-made opening; usually small | - |
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| (noun) a device that controls amount of light admitted | - |
| (noun) a natural opening in something | - |
| apery | (noun) the act of mimicking; imitative behavior | Synonyms: mimicry |
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| apetalous | (adjective) (of flowers) having no petals | Synonyms: petalless |
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| apex | (noun) the highest point (of something) | Synonyms: acme, peak, vertex |
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| (noun) the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars | Synonyms: apex of the sun's way, solar apex |
| aphaeresis | (noun) (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until' | Synonyms: apheresis |
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| aphaeretic | (adjective) relating to or formed by or consisting of aphaeresis | Synonyms: apheretic |
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| aphagia | (noun) loss of the ability to swallow | - |
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| aphakia | (noun) absence of the natural lens of the eye (usually resulting from the removal of cataracts) | - |
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| aphakic | (adjective) of or relating to or afflicted with aphakia | - |
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| (noun) someone afflicted by aphakia; someone lacking the natural lenses of the eyes | - |
| aphanite | (noun) fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye | - |
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| aphanitic | (adjective) of or relating to aphanite | - |
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| aphasia | (noun) inability to use or understand language (spoken or written) because of a brain lesion | - |
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| aphasic | (adjective) related to or affected by aphasia | - |
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| (adjective) unable to speak because of a brain lesion | - |
| (noun) someone affected by aphasia or inability to use or understand language | - |
| aphelion | (noun) apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun | - |
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| apheresis | (noun) a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion | Synonyms: pheresis |
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| (noun) (linguistics) omission at the beginning of a word as in `coon' for `raccoon' or `till' for `until' | Synonyms: aphaeresis |
| apheretic | (adjective) relating to or formed by or consisting of aphaeresis | Synonyms: aphaeretic |
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| aphesis | (noun) the gradual disappearance of an initial (usually unstressed) vowel or syllable as in `squire' for `esquire' | - |
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| aphetic | (adjective) produced by aphesis | - |
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| aphid | (noun) any of various small plant-sucking insects | - |
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