isotherm
/ˈaɪsəˌθɜrm/
noun
- A line on a map or chart connecting points of equal temperature.
- Meteorologists use isotherms to visualize temperature patterns in the atmosphere.
- The weather map showed isotherms running across the country, indicating a cold front moving south.
- On the climate graph, the isotherm for 20°C passes through the southern part of the region.