noun
- Lines on a map connecting points of equal numerical value (such as temperature, pressure, or rainfall).
Usage: technical; cartography and meteorology; plural form of isarithm
Examples
- Meteorologists use isarithms to show temperature patterns across a region.
- The weather map displayed isarithms connecting areas of equal atmospheric pressure.
- Isarithms on topographic maps help visualize elevation changes.
- The geographer drew isarithms to represent rainfall distribution.
- Climate maps often feature isarithms to illustrate temperature zones.