Source : Webster's Revised Unabridged Dictionary (1913)

Hoard \Hoard\, v. t. [imp. & p. p. {Hoarded}; p. pr. & vb. n.
   {Hoarding}.] [AS. hordian.]
   To collect and lay up; to amass and deposit in secret; to
   store secretly, or for the sake of keeping and accumulating;
   as, to hoard grain.

Hoarding \Hoard"ing\, n. [From OF. hourd, hourt, barrier,
   palisade, of German or Dutch origin; cf. D. horde hurdle,
   fence, G. horde, h["u]rde; akin to E. hurdle. [root]16. See
   {Hurdle}.]
   1. (Arch.) A screen of boards inclosing a house and materials
      while builders are at work. [Eng.]

            Posted on every dead wall and hoarding. --London
                                                  Graphic.

   2. A fence, barrier, or cover, inclosing, surrounding, or
      concealing something.

            The whole arrangement was surrounded by a hoarding,
            the space within which was divided into compartments
            by sheets of tin.                     --Tyndall.

Source : WordNet®

hoarding
     n : large outdoor signboard [syn: {billboard}]