Definitions

1. adjective

Relating to or denoting an isopleth, especially one showing a particular boundary or area on a map.

“The geographer studied the isopleural lines to understand the climate patterns in the region.”

2. noun

A line on a map showing the boundary of a particular area or feature, especially one with equal values or properties.

“The isopleural lines in the map indicated the regions with similar population densities.”