English

isocontour

From iso- + contour.

Ancient Greek ἴσος ‘equal’

English iso-

Vulgar Latin *contornāre

French contourner ‘to circumvent, to bypass, to skirt around’

French contour

Today it means

noun level set; an isoline (2D) or isosurface (3D)

Language periods are conventional ranges, not dates for this word.

Etymograph / isocontour