| isanemone | (noun) an isogram connecting points having equal wind speed. | - |
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| isarithm | (noun) a line drawn on a map connecting points having the same numerical value of some variable | Synonyms: isogram, isopleth |
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| isaw | (noun) a street food from the Philippines, made from barbecued pig or chicken intestines | - |
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| ischaemia | (noun) local anemia in a given body part sometimes resulting from vasoconstriction or thrombosis or embolism | Synonyms: ischemia |
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| ischemia | (noun) local anemia in a given body part sometimes resulting from vasoconstriction or thrombosis or embolism | Synonyms: ischaemia |
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| ischium | (noun) one of the three sections of the hipbone; situated below the ilium | Synonyms: ischial bone, os ischii |
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| isinglass | (noun) any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity | Synonyms: mica |
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| island | (noun) a zone or area resembling an island | - |
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| (noun) a land mass (smaller than a continent) that is surrounded by water | - |
| islander | (noun) an inhabitant of an island | Synonyms: island-dweller |
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| islay | (noun) California evergreen wild plum with spiny leathery leaves and white flowers | Synonyms: evergreen cherry, holly-leaf cherry, holly-leaved cherry, Prunus ilicifolia |
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| isle | (noun) a small island | Synonyms: islet |
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| islet | (noun) a small island | Synonyms: isle |
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| ism | (noun) a belief (or system of beliefs) accepted as authoritative by some group or school | Synonyms: doctrine, philosophical system, philosophy, school of thought |
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| 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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| isopropanol | (noun) alcohol used as antifreeze or a solvent | Synonyms: isopropyl alcohol |
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| isoproterenol | (noun) drug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heart | Synonyms: Isuprel |
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| isoseismal | (noun) a line on a map connecting points at which earthquake shocks are of equal intensity. | - |
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| isosorbide | (noun) drug (trade name Isordil) used to treat angina pectoris and congestive heart failure | Synonyms: Isordil |
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| isostasy | (noun) (geology) a general equilibrium of the forces tending to elevate or depress the earth's crust | - |
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| isosyllabism | (noun) (linguistics, poetry) the use of isosyllabic verse. | - |
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| isotach | (noun) a line joining points with constant wind speed. | - |
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| isothere | (noun) a line on a map linking places with the same mean summer temperature. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| isothiocyanate | (noun) a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations | - |
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| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| isotropy | (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: symmetry |
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| issuance | (noun) the act of providing an item for general use or for official purposes (usually in quantity) | Synonyms: issue, issuing |
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| issue | (noun) the act of issuing printed materials | Synonyms: publication |
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| (noun) the act of providing an item for general use or for official purposes (usually in quantity) | Synonyms: issuance, issuing |
| (noun) an opening that permits escape or release | Synonyms: exit, outlet, way out |
| (noun) some situation or event that is thought about | Synonyms: matter, subject, topic |
| (noun) an important question that is in dispute and must be settled | - |
| (noun) one of a series published periodically | Synonyms: number |
| (noun) the becoming visible | Synonyms: egress, emergence |
| (noun) the immediate descendants of a person | Synonyms: offspring, progeny |
| (noun) a phenomenon that follows and is caused by some previous phenomenon | Synonyms: consequence, effect, event, outcome, result, upshot |
| (noun) the income or profit arising from such transactions as the sale of land or other property | Synonyms: payoff, proceeds, return, take, takings, yield |
| (noun) supplies (as food or clothing or ammunition) issued by the government | Synonyms: government issue, military issue |
| issuer | (noun) an institution that issues something (securities or publications or currency etc.) | - |
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| issuing | (noun) the act of providing an item for general use or for official purposes (usually in quantity) | Synonyms: issuance, issue |
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| isthmus | (noun) a cord-like tissue connecting two larger parts of an anatomical structure | Synonyms: band |
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| (noun) a relatively narrow strip of land (with water on both sides) connecting two larger land areas | - |