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isotherm Meaning, Definition & Usage

  1. noun (meteorology) an isogram connecting points having the same temperature at a given time
WordNet

I"so*therm noun
Etymology
Iso- + Gr. heat, fr. hot.
Definitions
  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.

Webster 1913