noun
- a line on a map or chart connecting points of equal numerical value (such as temperature, pressure, or rainfall).
Usage: technical; cartography and meteorology
Examples
- Meteorologists use isarithms to display temperature patterns across a region.
- The weather map showed isarithms indicating areas of equal atmospheric pressure.
- An isarithm connecting all points with the same rainfall helps identify wet zones.
- Geographers rely on isarithms to visualize data distribution on thematic maps.
- The isarithm technique makes it easier to compare values across different locations.