lineation (iou)

lineation noun. LME.
[Latin lineatio(n-), formed as LINEATE verb: see -ATION.]
The action or process of drawing lines or marking something with lines; an instance of this; a contour, an outline. Also, a marking or line on a surface, esp. of the skin. LME.
b. Linear markings; an arrangement or group of lines. M16.
A division into lines. M19.
Geology. A linear feature observed in rock etc. M20.