hoarding

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A temporary wooden fence around a building or structure under construction or repair.
• noun Chiefly British A billboard.

from The Century Dictionary.

• noun The act of amassing or making a hoard.
• noun In medieval fortification, a covered structure of timber, either temporary or permanent, placed on top of the walls and towers of a fortress to afford increased facilities for defense.
• noun A fence for inclosing a house and materials while builders are at work; any similar inclosure of boards.
• noun Hence A bill-board; any boarding on which bills are posted.
• noun Also hoard.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Arch.), engraving A screen of boards inclosing a house and materials while builders are at work.
• noun A fence, barrier, or cover, inclosing, surrounding, or concealing something.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb Present participle of hoard.
• noun UK A temporary fence-like structure built around building work to add security and prevent accidents to the public.
• noun A roofed wooden shield placed over the battlements of a castle and projecting from them.
• noun chiefly UK A billboard.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun large outdoor signboard