keyline

Etymology

From key + line.

keyline means A contour line connecting all points in valley at the same elevation as the keypoint, used in planning efficient water usage. Lexicurio rates it Sui generis — a strength score of 89 out of 100.

noun

A contour line connecting all points in valley at the same elevation as the keypoint, used in planning efficient water usage.
A boundary line that separates color and monochromatic areas or differently colored areas of print.