The Collaborative International Dictionary of English v.0.48:

ormolu \or`mo*lu"\ ([^o]r`m[-o]*l[udd]"), n. [F. or moulu; or
   gold (L. aurum) + moulu, p. p. of moudre to grind, to mill,
   L. molere. See Aureate, and Mill.]
   A variety of brass made to resemble gold by the use of less
   zinc and more copper in its composition than ordinary brass
   contains. Its golden color is often heightened by means of
   lacquer of some sort, or by use of acids. Called also mosaic
   gold.
   [1913 Webster]

   ormolu varnish, a varnish applied to metals, as brass, to
      give the appearance of gold.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ormolu
    n 1: brass that looks like gold; used to decorate furniture