| 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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| isopteran | (adjective) relating to or characteristic of insects of the order Isoptera | - |
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