[1] : The Collaborative International Dictionary of English v.0.48

lumber \lum"ber\, n. prob. fr. lombard, the lombards being the
   money lenders and pawnbrokers of the middle ages. a lumber
   room was, according to trench, originally a lombard room, or
   room where the lombard pawnbroker stored his pledges. see
   lombard.
   1. a pawnbroker's shop, or room for storing articles put in
      pawn; hence, a pledge, or pawn. obs.
      1913 webster

            they put all the little plate they had in the
            lumber, which is pawning it, till the ships came.
                                                  --lady murray.
      1913 webster

   2. old or refuse household stuff; things cumbrous, or bulky
      and useless, or of small value.
      1913 webster

   3. timber sawed or split into the form of beams, joists,
      boards, planks, staves, hoops, etc.; esp., that which is
      smaller than heavy timber. u.s.
      1913 webster

   lumber kiln, a room in which timber or lumber is dried by
      artificial heat. u.s.

   lumber room, a room in which unused furniture or other
      lumber is kept. u.s.

   lumber wagon, a heavy rough wagon, without springs, used
      for general farmwork, etc.

   dimensional lumber, lumber, usually of pine, which is sold
      as beams or planks having a specified nominal
      cross-section, usually in inches, such a two-by-four,
      two-by-six, four-by-four, etc.
      1913 webster +pjc
see also:
lombard lumber kiln lumber room lumber wagon dimensional lumber 

[2] : WordNet (r) 2.0

lumber room
     n : a storeroom in a house where odds and ends can be stored
         especially furniture

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