| 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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| isogonic | (adjective) having or making equal angles | - |
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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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