Source : Webster's Revised Unabridged Dictionary (1913)

Mantel \Man"tel\, n. [The same word as mantle a garment; cf. F.
   manteau de chemin['e]e. See {Mantle}.] (Arch.)
   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. [Written also {mantle}.]

Source : WordNet®

mantel
     n : shelf that projects from wall above fireplace; "in England
         they call a mantel a chimneypiece" [syn: {mantelpiece}, {mantle},
          {mantlepiece}, {chimneypiece}]