noun
(art, photography) A decorative border around a picture used to inset and center the contents of a frame.
(film) A background, often painted or created with computers
(pyrometallurgy) The molten metal sulfide phases typically formed during smelting of copper, nickel, and other base metals.
An instrument for producing a dull, lustreless surface.
adjective
(American spelling) Dull; not reflective of light.
verb
(transitive) To produce a dull, lustreless surface on (metal).