isarithm
/ˈaɪsəˌrɪðəm/
noun
- A line on a map or chart connecting points of equal value for a given variable, such as temperature, rainfall, or elevation.
- The weather map used isarithms to show areas with the same amount of rainfall.
- The isarithm for temperature clearly showed a warm band across the southern states.
- Topographic maps use isarithms called contour lines to represent elevation.
Synonyms