tracing

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A reproduction made by superimposing a transparent sheet and copying the lines of the original on it.
• noun A graphic record made by a recording instrument, such as a cardiograph or seismograph.

from The Century Dictionary.

• noun The act of one who traces.
• noun A track or path; a course.
• noun A mechanical copy of a design or drawing, made by reproducing its lines as seen through a transparent medium, as tracing-paper.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.
• noun A regular path or track; a course.
• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The reproduction of an image made by copying it through translucent paper.
• noun A record in the form of a graph made by a device such as a seismograph.
• noun The process of finding something that is lost by studying evidence.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of drawing a plan or diagram or outline
• noun a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image
• noun the discovery and description of the course of development of something