Tracing /(?)/

Tra·cing

Tracing

n.
  1. The act of one who traces; especially, the act of copying by marking on thin paper, or other transparent substance, the lines of a pattern placed beneath; also, the copy thus producted.
  2. A regular path or track; a course.

Phrases & Compounds
Tracing cloth
specially prepared transparent cloth or paper, which enables a drawing or print to be clearly seen through it, and so allows the use of a pen or pencil to produce a facsimile by following the lines of the original placed beneath.