noun (n)

• shelf that projects from wall above fireplace(noun.artifact)

  Example:
  In Britain they call a mantel a chimneypiece.
  

  Synonym:
  chimneypiece, mantelpiece, mantle, mantlepiece
  

  source: wordnet30
• The finish around a fireplace, covering the chimney-breast in front and sometimes on both sides; especially, a shelf above the fireplace, and its supports.(noun)

  source: webster1913