Definitions

1. adjective

relating to or denoting a curve or line that separates areas of different characteristics, such as temperature or composition, in a diagram or map.

“The isoplethic lines on the geology map helped researchers understand the rock formation patterns.”

2. noun

a curve or line that separates areas of different characteristics in a diagram or map.

“The isopleths on the weather map showed the areas of high and low pressure.”