Source : Webster's Revised Unabridged Dictionary (1913)

Ironing \I"ron*ing\, n.
   1. The act or process of smoothing, as clothes, with hot
      flatirons.

   2. The clothes ironed.

   {Ironing board}, a flat board, upon which clothes are laid
      being ironed.

Source : WordNet®

ironing board
     n : narrow padded board on collapsible supports; used for
         ironing clothes