'Mattoir' definitions:

Definition of 'Mattoir'

From: GCIDE

Mattoir \Mat*toir"\, n. [F. matoir.] (Engraving) A kind of coarse punch with a rasplike face, used for making a rough surface on etching ground, or on the naked copper, the effect after biting being very similar to stippled lines. [Webster 1913 Suppl.]