isotherm Meaning, Definition & Usage
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noun (meteorology) an isogram connecting points having the same temperature at a given time
WordNet
I"so*therm noun
Etymology
Definitions
(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.