The Collaborative International Dictionary of English v.0.48:

Matte \Matte\ (m[a^]t), n. [F. matte; cf. F. mat, masc., matte,
   fem., faint, dull, dim; -- said of metals. See Mate
   checkmate.]
   1. (Metallurgy) A partly reduced copper sulphide, obtained by
      alternately roasting and melting copper ore in separating
      the metal from associated iron ores, and called coarse
      metal, fine metal, etc., according to the grade of
      fineness. On the exterior it is dark brown or black, but
      on a fresh surface is yellow or bronzy in color.
      [1913 Webster]

   2. A dead or dull finish, as in gilding where the gold leaf
      is not burnished, or in painting where the surface is
      purposely deprived of gloss.
      [1913 Webster]