matte

Short definition from Wiktionary

Noun

1. 1
   A decorative border around a picture used to inset and center the contents of a frame.
2. 2
   A background, often painted or created with computers
3. 3
   The molten metal sulfide phases typically formed during smelting of copper, nickel, and other base metals.
4. 4
   An instrument for producing a dull, lustreless surface.

Adjective

1. 1
   Dull; not reflective of light.

Verb

1. 1
   To produce a dull, lustreless surface on (metal).