| 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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| isothermal | (adjective) of a process or change taking place at constant temperature | - |
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| isothermic | (adjective) of or relating to an isotherm | - |
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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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| isotonic | (adjective) (used of solutions) having the same or equal osmotic pressure | Synonyms: isosmotic |
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| (adjective) of or involving muscular contraction in which tension is constant while length changes | - |
| (adjective) relating to or characterized by the equal intervals of a musical scale | - |
| (adjective) of two or more muscles; having equal tension | - |
| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| isotopic | (adjective) of or relating to or having the relation of an isotope | - |
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| isotropic | (adjective) invariant with respect to direction | Synonyms: isotropous |
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| isotropically | (adverb) in an isotropic manner | - |
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| isotropous | (adjective) invariant with respect to direction | Synonyms: isotropic |
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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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