scoriation

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

• noun A sloppily cut groove, furrow, or trench, characterised by the presence of refuse material from which it was cut. The word is derived from the Latin scoria, which means slag or dross , and thus is related to the english words scoria and scorify, which both refer to the waste left over from smelting ore.
• noun An anthropological term used to describe grooves or other similar markings on bullets exclusively. Scoriation is a joining of "scoring" and "striation."
• noun aphetic form of excoriation