| hyperpnea | (noun) energetic (deep and rapid) respiration that occurs normally after exercise or abnormally with fever or various disorders | - |
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| hyperpyrexia | (noun) extremely high fever (especially in children) | - |
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| hypersecretion | (noun) excessive secretion | - |
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| hypersensitivity | (noun) extreme sensitivity | - |
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| (noun) pathological sensitivity | - |
| hypersomnia | (noun) an inability to stay awake | - |
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| hypersplenism | (noun) enlarged spleen and a decrease in one or more types of blood cells; associated with many disorders | - |
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| hypertension | (noun) a common disorder in which blood pressure remains abnormally high (a reading of 140/90 mm Hg or greater) | Synonyms: high blood pressure |
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| hypertensive | (noun) a person who has abnormally high blood pressure | - |
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| hypertext | (noun) machine-readable text that is not sequential but is organized so that related items of information are connected | - |
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| hyperthermia | (noun) abnormally high body temperature; sometimes induced (as in treating some forms of cancer) | Synonyms: hyperthermy |
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| hyperthermy | (noun) abnormally high body temperature; sometimes induced (as in treating some forms of cancer) | Synonyms: hyperthermia |
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| hyperthyroidism | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: thyrotoxicosis |
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| hypertonia | (noun) (of muscular tissue) the state of being hypertonic | Synonyms: hypertonicity, hypertonus |
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| hypertonicity | (noun) (of muscular tissue) the state of being hypertonic | Synonyms: hypertonia, hypertonus |
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| (noun) (of a solution) the extent to which a solution has a higher osmotic pressure than some other | - |
| hypertonus | (noun) (of muscular tissue) the state of being hypertonic | Synonyms: hypertonia, hypertonicity |
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| hypertrophy | (noun) abnormal enlargement of a body part or organ | - |
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| hypervelocity | (noun) excessive velocity | - |
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| hyperventilation | (noun) an increased depth and rate of breathing greater than demanded by the body needs; can cause dizziness and tingling of the fingers and toes and chest pain if continued | - |
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| hypervitaminosis | (noun) an abnormal condition resulting from taking vitamins excessively; can be serious for vitamins A or D or K | - |
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| hypervolaemia | (noun) a blood disorder consisting of an increase in the volume of circulating blood | Synonyms: hypervolemia |
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| hypervolemia | (noun) a blood disorder consisting of an increase in the volume of circulating blood | Synonyms: hypervolaemia |
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| imperative | (noun) some duty that is essential and urgent | - |
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| (noun) a verb in the imperative mood. | Synonyms: imperative verb |
| (noun) a mood that expresses an intention to influence the listener's behavior | Synonyms: imperative form, imperative mood, jussive mood |
| imperativeness | (noun) the quality of being insistent | Synonyms: instancy |
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| (noun) the state of demanding notice or attention | Synonyms: insistence, insistency, press, pressure |
| imperceptibility | (noun) the property of being imperceptible by the mind or the senses | - |
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| imperfect | (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect tense, progressive, progressive tense |
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| imperfectibility | (noun) the capability of becoming imperfect | - |
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| imperfection | (noun) the state or an instance of being imperfect | Synonyms: imperfectness |
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| imperfective | (noun) aspect without regard to the beginning or completion of the action of the verb | Synonyms: imperfective aspect |
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| imperfectness | (noun) the state or an instance of being imperfect | Synonyms: imperfection |
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| imperial | (noun) a piece of luggage carried on top of a coach | - |
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| (noun) a small tufted beard worn by Emperor Napoleon III | Synonyms: imperial beard |
| imperialism | (noun) any instance of aggressive extension of authority | - |
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| (noun) a political orientation that advocates imperial interests | - |
| (noun) a policy of extending your rule over foreign countries | - |
| imperialist | (noun) a believer in imperialism | - |
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| imperialness | (noun) The quality of being related to an empire, emperor, or empress. | - |
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| imperiousness | (noun) the trait of being imperious and overbearing | Synonyms: domineeringness, overbearingness |
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| imperishability | (noun) the property of being resistant to decay | Synonyms: imperishableness, imperishingness |
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| imperishableness | (noun) the property of being resistant to decay | Synonyms: imperishability, imperishingness |
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| imperishingness | (noun) the property of being resistant to decay | Synonyms: imperishability, imperishableness |
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| imperium | (noun) supreme authority; absolute dominion | - |
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| (noun) the domain ruled by an emperor or empress; the region over which imperial dominion is exercised | Synonyms: empire |
| impermanence | (noun) the property of not existing for indefinitely long durations | Synonyms: impermanency |
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| impermanency | (noun) the property of not existing for indefinitely long durations | Synonyms: impermanence |
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| impermeability | (noun) the property of something that cannot be pervaded by a liquid | Synonyms: impermeableness |
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| impermeableness | (noun) the property of something that cannot be pervaded by a liquid | Synonyms: impermeability |
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| impermissibility | (noun) inadmissibility as a consequence of not being permitted | - |
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| impersonation | (noun) imitating the mannerisms of another person | Synonyms: personation |
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| (noun) pretending to be another person | Synonyms: imposture |
| (noun) a representation of a person that is exaggerated for comic effect | Synonyms: caricature, imitation |
| impersonator | (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: imitator |
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| impertinence | (noun) inappropriate playfulness | Synonyms: archness, perkiness, pertness, sauciness |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impudence, insolence |
| (noun) an impudent statement | Synonyms: cheek, impudence |
| imperturbability | (noun) calm and unruffled self-assurance | Synonyms: coolness, imperturbableness |
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| imperturbableness | (noun) calm and unruffled self-assurance | Synonyms: coolness, imperturbability |
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| imperviousness | (noun) the quality of being impenetrable (by people or light or missiles etc.) | Synonyms: impenetrability |
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| improperness | (noun) an improper demeanor | Synonyms: impropriety |
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| inexperience | (noun) lack of experience and the knowledge and understanding derived from experience | Synonyms: rawness |
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| innkeeper | (noun) the owner or manager of an inn | Synonyms: boniface, host |
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| intemperance | (noun) excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence | Synonyms: intemperateness, self-indulgence |
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| (noun) consumption of alcoholic drinks | Synonyms: intemperateness |
| (noun) the quality of being intemperate | - |
| intemperateness | (noun) excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence | Synonyms: intemperance, self-indulgence |
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| (noun) consumption of alcoholic drinks | Synonyms: intemperance |
| interloper | (noun) someone who intrudes on the privacy or property of another without permission | Synonyms: intruder, trespasser |
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| interoperability | (noun) (computer science) the ability to exchange and use information (usually in a large heterogeneous network made up of several local area networks) | - |
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| interspersal | (noun) the act of combining one thing at intervals among other things | Synonyms: interspersion |
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| interspersion | (noun) the act of combining one thing at intervals among other things | Synonyms: interspersal |
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| japery | (noun) acting like a clown or buffoon | Synonyms: buffoonery, clowning, frivolity, harlequinade, prank |
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| jasper | (noun) an opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone | - |
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| jumper | (noun) (basketball) a player releases the basketball at the high point of a jump | Synonyms: jump shot |
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| (noun) a sleeveless dress resembling an apron; worn over other clothing | Synonyms: pinafore, pinny |
| (noun) a loose jacket or blouse worn by workmen | - |
| (noun) a small connector used to make temporary electrical connections | - |
| (noun) a coverall worn by children | - |
| (noun) a crocheted or knitted garment covering the upper part of the body | Synonyms: sweater |
| (noun) an athlete who competes at jumping | - |
| (noun) a person who jumps | - |
| juniper | (noun) wood of a coniferous shrub or small tree with berrylike cones | - |
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| (noun) desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista | Synonyms: Genista raetam, juniper bush, raetam, Retama raetam, retem |
| (noun) coniferous shrub or small tree with berrylike cones | - |
| keeper | (noun) one having charge of buildings or grounds or animals | Synonyms: custodian, steward |
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| (noun) someone in charge of other people | - |
| kidnaper | (noun) someone who unlawfully seizes and detains a victim (usually for ransom) | Synonyms: abductor, kidnapper, snatcher |
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| kidnapper | (noun) someone who unlawfully seizes and detains a victim (usually for ransom) | Synonyms: abductor, kidnaper, snatcher |
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| kinsperson | (noun) a person having kinship with another or others | Synonyms: family, kin |
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| kipper | (noun) salted and smoked herring | Synonyms: kippered herring |
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| landscaper | (noun) someone who arranges features of the landscape or garden attractively | Synonyms: landscape architect, landscape gardener, landscapist |
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| layperson | (noun) someone who is not a clergyman or a professional person | Synonyms: layman, secular |
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| leafhopper | (noun) small leaping insect that sucks the juices of plants | - |
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| leaper | (noun) someone who bounds or leaps (as in competition) | Synonyms: bounder |
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| leper | (noun) a pariah who is avoided by others | - |
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| (noun) a person afflicted with leprosy | Synonyms: lazar |
| limper | (noun) someone who has a limp and walks with a hobbling gait | Synonyms: hobbler |
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| linendraper | (noun) a retail dealer in yard goods | - |
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| lisper | (noun) a speaker who lisps | - |
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| lockkeeper | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockman, lockmaster |
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| looper | (noun) small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae | Synonyms: inchworm, measuring worm |
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| lopper | (noun) a long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees | Synonyms: pruner, pruning hook |
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| lumper | (noun) a taxonomist who classifies organisms into large groups on the basis of major characteristics | - |
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| (noun) a laborer who loads and unloads vessels in a port | Synonyms: dock-walloper, dock worker, docker, dockhand, dockworker, loader, longshoreman, stevedore |
| mapper | (noun) a clerk who marks data on a chart | Synonyms: plotter |
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| meperidine | (noun) a synthetic narcotic drug (trade name Demerol) used to treat pain | Synonyms: Demerol, meperidine hydrochloride |
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| milliampere | (noun) one thousandth of an ampere | Synonyms: mA |
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| minesweeper | (noun) ship equipped to detect and then destroy or neutralize or remove marine mines | - |
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| mopper | (noun) a worker who uses a mop to clean a surface | - |
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| mudskipper | (noun) found in tropical coastal regions of Africa and Asia; able to move on land on strong pectoral fins | Synonyms: mudspringer |
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| napery | (noun) linens for the dining table | Synonyms: table linen |
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| netkeeper | (noun) the defensive position on an ice hockey or soccer or lacrosse team who stands in front of the goal and tries to prevent opposing players from scoring | Synonyms: goalie, goalkeeper, goaltender |
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| (noun) the soccer or hockey player assigned to protect the goal | Synonyms: goalie, goalkeeper, goaltender, netminder |
| newspaper | (noun) the physical object that is the product of a newspaper publisher | Synonyms: paper |
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| (noun) a daily or weekly publication on folded sheets; contains news and articles and advertisements | Synonyms: paper |
| (noun) a business firm that publishes newspapers | Synonyms: newspaper publisher, paper |
| (noun) cheap paper made from wood pulp and used for printing newspapers | Synonyms: newsprint |
| newspapering | (noun) journalism practiced for the newspapers | - |
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| newspaperman | (noun) a male journalist employed to provide news stories for newspapers or broadcast media | Synonyms: pressman |
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| newspaperwoman | (noun) a female journalist employed to provide news stories for newspapers or broadcast media | - |
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| newsperson | (noun) a person who investigates and reports or edits news stories | Synonyms: reporter |
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| nipper | (noun) a grasping structure on the limb of a crustacean or other arthropods | Synonyms: chela, claw, pincer |
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| (noun) a young person of either sex | Synonyms: child, fry, kid, minor, nestling, shaver, small fry, tiddler, tike, tyke, youngster |
| nonperformance | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, negligence |
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| nonperson | (noun) a person regarded as nonexistent and having no rights; a person whose existence is systematically ignored (especially for ideological or political reasons) | Synonyms: unperson |
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| notepaper | (noun) writing paper intended for writing short notes or letters | - |
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| obstreperousness | (noun) noisy defiance | - |
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| oilpaper | (noun) paper that has been made translucent and waterproof by soaking in oil | - |
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| oligospermia | (noun) insufficient spermatozoa in the semen | - |
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| opera | (noun) a building where musical dramas are performed | Synonyms: opera house |
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| (noun) a drama set to music; consists of singing with orchestral accompaniment and an orchestral overture and interludes | - |