repoussé

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Shaped or decorated with patterns in relief formed by hammering and pressing on the reverse side. Used especially of metal.
• adjective Raised in relief.
• noun A design in relief.
• noun The technique of hammering and pressing designs in relief.

from The Century Dictionary.

• Raised in relief by means of the hammer; beaten up from the under or reverse side.
• noun Repoussé work; the art of shaping vessels and the like, and of producing ornament on the surface, by hammering thin metal on the reverse side, the artist watching the side destined to be exposed to follow the development of the pattern by the blows of the hammer; also, the articles thus produced.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Formed in relief, as a pattern on metal.
• adjective Ornamented with patterns in relief made by pressing or hammering on the reverse side; -- said of thin metal, or of a vessel made of thin metal.
• adjective ornamentation of metal in relief by pressing or hammering on the reverse side.

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

• noun A metalworking technique in which a malleable metal is ornamented or shaped by hammering from the reverse side.