GNU Collaborative International Dictionary of English

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  1.       
    
    Isotherm , n. [Iso- + Gr. heat, fr. hot.]
    1. (Phys. Geog.) A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.
      1913 Webster
    2. (Physics) A line on a graph connecting points representing states having the same temperature; an isothermal line.
      PJC

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