The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.]
      [1913 Webster]

            Posted on every dead wall and hoarding. --London
                                                  Graphic.
      [1913 Webster]

   2. A fence, barrier, or cover, inclosing, surrounding, or
      concealing something.
      [1913 Webster]

            The whole arrangement was surrounded by a hoarding,
            the space within which was divided into compartments
            by sheets of tin.                     --Tyndall.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hoarding
    n 1: large outdoor signboard [syn: billboard, hoarding]

The Jargon File (version 4.4.7, 29 Dec 2003):

hoarding
 n.

    See software hoarding.