| garrison | (noun) a fortified military post where troops are stationed | Synonyms: fort |
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| (noun) the troops who maintain and guard a fortified place | - |
| gasohol | (noun) a gasoline substitute consisting of 90% gasoline and 10% grain alcohol from corn | - |
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| gasolene | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasoline, petrol |
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| gasoline | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasolene, petrol |
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| gasometer | (noun) a large gas-tight spherical or cylindrical tank for holding gas to be used as fuel | Synonyms: gas holder |
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| (noun) a meter for measuring the amount of gas flowing through a particular pipe | Synonyms: gas meter |
| gesso | (noun) gypsum or plaster of Paris spread on a surface to make it suitable for painting or gilding (or a surface so prepared) | - |
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| girasol | (noun) tall perennial with hairy stems and leaves; widely cultivated for its large irregular edible tubers | Synonyms: Helianthus tuberosus, Jerusalem artichoke, Jerusalem artichoke sunflower |
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| (noun) an opal with flaming orange and yellow and red colors | Synonyms: fire opal |
| gladsomeness | (noun) experiencing joy and pleasure | Synonyms: gladfulness, gladness |
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| glossodynia | (noun) pain in the tongue | Synonyms: glossalgia |
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| glossolalia | (noun) repetitive nonmeaningful speech (especially that associated with a trance state or religious fervor) | - |
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| glossoptosis | (noun) abnormal downward or back placement of the tongue | - |
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| godson | (noun) a male godchild | - |
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| grandson | (noun) a male grandchild | - |
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| grison | (noun) carnivore of Central America and South America resembling a weasel with a greyish-white back and dark underparts | Synonyms: Galictis vittatus, Grison vittatus |
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| gruesomeness | (noun) the quality of being ghastly | Synonyms: ghastliness, grimness, luridness |
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| gymnosophist | (noun) member of a Hindu sect practicing gymnosophy (especially nudism) | - |
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| gymnosophy | (noun) the doctrine of a sect of Hindu philosophers who practiced nudity and asceticism and meditation | - |
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| handsomeness | (noun) the quality of having regular well-defined features (especially of a man) | Synonyms: good looks |
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| hansom | (noun) a two-wheeled horse-drawn covered carriage with the driver's seat above and behind the passengers | Synonyms: hansom cab |
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| hassock | (noun) a cushion for kneeling on (as when praying in church) | - |
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| (noun) thick cushion used as a seat | Synonyms: ottoman, pouf, pouffe, puff |
| hessonite | (noun) a garnet ranging in color from yellow to brown | Synonyms: cinnamon stone, essonite |
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| hydrocortisone | (noun) an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism | Synonyms: Cortef, cortisol, Hydrocortone |
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| hydroisohypse | (noun) a line on a map connecting points of equal level on the piezometric surface. | - |
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| hydroisopieze | (noun) a line on a map connecting points of identical pressures in the water bearing stratum. | - |
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| hydrosol | (noun) a sol (colloid) in which the continuous phase is water. | - |
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| hypersomnia | (noun) an inability to stay awake | - |
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| hypsography | (noun) measurement of the elevation of land above sea level | Synonyms: hypsometry |
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| (noun) the scientific study of the earth's configuration above sea level (emphasizing the measurement of land altitudes relative to sea level) | - |
| hypsometer | (noun) an altimeter that uses the boiling point of water to determine land elevation | - |
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| hypsometry | (noun) measurement of the elevation of land above sea level | Synonyms: hypsography |
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| hyson | (noun) a Chinese green tea with twisted leaves | - |
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| hyssop | (noun) bitter leaves used sparingly in salads; dried flowers used in soups and tisanes | - |
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| (noun) a European mint with aromatic and pungent leaves used in perfumery and as a seasoning in cookery; often cultivated as a remedy for bruises; yields hyssop oil | Synonyms: Hyssopus officinalis |
| illusoriness | (noun) The quality of resulting from an illusion; of being deceptive, imaginary, unreal. | - |
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| immunosuppressor | (noun) a drug that lowers the body's normal immune response | Synonyms: immune suppressant drug, immunosuppressant, immunosuppressive, immunosuppressive drug |
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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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| imprisonment | (noun) the act of confining someone in a prison (or as if in a prison) | Synonyms: internment |
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| (noun) putting someone in prison or in jail as lawful punishment | - |
| (noun) the state of being imprisoned | Synonyms: captivity, immurement, incarceration |
| incienso | (noun) fragrant rounded shrub of southwestern United States and adjacent Mexico having brittle stems and small crowded blue-green leaves and yellow flowers; produces a resin used in incense and varnish and in folk medicine | Synonyms: brittle bush, brittlebush, Encelia farinosa |
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| incisor | (noun) a tooth for cutting or gnawing; located in the front of the mouth in both jaws | - |
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| infusorian | (noun) any member of the subclass Infusoria | - |
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| innersole | (noun) the inner sole of a shoe or boot where the foot rests | Synonyms: insole |
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| insobriety | (noun) a temporary state resulting from excessive consumption of alcohol | Synonyms: drunkenness, inebriation, inebriety, intoxication, tipsiness |
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| insolation | (noun) therapeutic exposure to sunlight | Synonyms: heliotherapy |
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| (noun) incident solar radiation | - |
| (noun) sudden prostration due to exposure to the sun or excessive heat | Synonyms: siriasis, sunstroke, thermic fever |
| insole | (noun) the inner sole of a shoe or boot where the foot rests | Synonyms: innersole |
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| insolence | (noun) an offensive disrespectful impudent act | - |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, impudence |
| insolubility | (noun) the quality of being insoluble and difficult to dissolve in liquid | - |
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| (noun) the property (of a problem or difficulty) that makes it impossible to solve | Synonyms: unsolvability |
| insolvency | (noun) the lack of financial resources | - |
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| insolvent | (noun) someone who has insufficient assets to cover their debts | Synonyms: bankrupt |
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| insomnia | (noun) an inability to sleep; chronic sleeplessness | - |
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| insomniac | (noun) someone who cannot sleep | Synonyms: sleepless person |
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| insouciance | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, lightheartedness, lightsomeness |
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| intercessor | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intermediary, intermediator, mediator |
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| irresoluteness | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresolution |
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| irresolution | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresoluteness |
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| (noun) doubt concerning two or more possible alternatives or courses of action | Synonyms: indecision, indecisiveness |
| isoagglutination | (noun) agglutination of an agglutinogen of one individual by a serum from another individual of the same species | - |
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| isoagglutinin | (noun) an antibody produced by one individual that causes agglutination of red blood cells in other individuals of the same species | - |
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| isoagglutinogen | (noun) an antigen capable of causing the production of (or reacting with) an isoagglutinin | - |
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| isoantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: alloantibody |
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| isobar | (noun) (meteorology)an isogram connecting points having equal barometric pressure at a given time | - |
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| isobase | (noun) a line drawn on a map or chart connecting places of equal or constant land upheaval. | - |
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| isobront | (noun) a line drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously. | - |
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| isobutylene | (noun) used also in making gasoline components | - |
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| isocarboxazid | (noun) a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression | Synonyms: Marplan |
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| isochalaz | (noun) a line indicating a constant frequency of hail storms. | - |
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| isocheim | (noun) a line on a map connecting places with the same mean winter temperature. | - |
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| isochrone | (noun) an isogram connecting points at which something occurs or arrives at the same time | - |
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| isochronism | (noun) the property of occuring regularly at equal time intervals, of maintaining a constant period or interval, despite variations in other measurable factors in the same system. | - |
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| isoclinal | (noun) an isogram connecting points of equal magnetic inclination | Synonyms: isoclinic line |
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| isocryme | (noun) a line connecting points on the earth's surface having the same mean temperature in the coldest month of the year. | - |
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| isocyanate | (noun) a salt or ester of isocyanic acid | - |
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| isoflurane | (noun) a widely used inhalation anesthetic | - |
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| isogamete | (noun) either of a pair of conjugating gametes of the same size and structure | - |
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| isogamy | (noun) (biology) reproduction by the union or fusion of gametes of the same size and structure | - |
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| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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| isogloss | (noun) the locative boundary of a certain linguistic feature, such as the pronunciation of a vowel, the meaning of a word, or use of some syntactic feature. | Synonyms: heterogloss |
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| isogon | (noun) an equiangular polygon | - |
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| isogone | (noun) an imaginary line connecting points on the Earth's surface where the magnetic declination is the same | Synonyms: isogonal line, isogonic line |
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| isogram | (noun) a line drawn on a map connecting points having the same numerical value of some variable | Synonyms: isarithm, isopleth |
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| isohel | (noun) an isogram connecting points receiving equal amounts of sunshine | - |
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| isolation | (noun) the act of isolating something; setting something apart from others | Synonyms: closing off |
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| (noun) a country's withdrawal from international politics | - |
| (noun) a feeling of being disliked and alone | - |
| (noun) (psychiatry) a defense mechanism in which memory of an unacceptable act or impulse is separated from the emotion originally associated with it | - |
| (noun) a state of separation between persons or groups | - |
| isolationism | (noun) a policy of nonparticipation in international economic and political relations | - |
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| isolationist | (noun) an advocate of isolationism in international affairs | - |
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| isoleucine | (noun) an essential amino acid found in proteins; isomeric with leucine | - |
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| isolex | (noun) an isogloss marking off the area in which a particular item of vocabulary is found. | - |
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| isomer | (noun) a compound that exists in forms having different arrangements of atoms but the same molecular weight | - |
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| isomerase | (noun) an enzyme that catalyzes its substrate to an isomeric form | - |
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| isomerisation | (noun) the conversion of a compound into an isomer of itself | Synonyms: isomerization |
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| isomerism | (noun) the state of being an isomer; the complex of chemical and physical phenomena characteristic of isomers | - |
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| isomerization | (noun) the conversion of a compound into an isomer of itself | Synonyms: isomerisation |
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| isometric | (noun) a line connecting isometric points | Synonyms: isometric line |
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| isometrics | (noun) muscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change) | Synonyms: isometric exercise |
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| isometropia | (noun) equality of refractive power in the two eyes | - |
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| isometry | (noun) equality of measure (e.g., equality of height above sea level or equality of loudness etc.) | - |
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| (noun) equality of elevation above sea level | - |
| (noun) a one-to-one mapping of one metric space into another metric space that preserves the distances between each pair of points | - |
| (noun) the growth rates in different parts of a growing organism are the same | - |
| isomorphism | (noun) (biology) similarity or identity of form or shape or structure | Synonyms: isomorphy |
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| isomorphy | (noun) (biology) similarity or identity of form or shape or structure | Synonyms: isomorphism |
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| isoniazid | (noun) antibacterial drug (trade name Nydrazid) used to treat tuberculosis | Synonyms: INH, Nydrazid |
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| isophene | (noun) a line indicating biological events occurring with coincidence such as plants flowering. | - |
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| isophone | (noun) linguistics, an isogloss marking off an area in which a particular feature of pronunciation is found. | - |
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| isopieze | (noun) a line on a map connecting places with equal ground water pressure. | Synonyms: isopiestic line |
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| isopleth | (noun) a line drawn on a map connecting points having the same numerical value of some variable | Synonyms: isarithm, isogram |
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| isopod | (noun) any of various small terrestrial or aquatic crustaceans with seven pairs of legs adapted for crawling | - |
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