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

packing \pack"ing\, n.
   1. the act or process of one who packs.
      1913 webster

   2. any material used to pack, fill up, or make close.
      specifically mach.: a substance or piece used to make a
      joint impervious; as:
      a a thin layer, or sheet, of yielding or elastic
          material inserted between the surfaces of a flange
          joint.
      b the substance in a stuffing box, through which a
          piston rod slides.
      c a yielding ring, as of metal, which surrounds a piston
          and maintains a tight fit, as inside a cylinder, etc.
          1913 webster

   3. masonry same as filling. rare in the u. s.
      1913 webster

   4. a trick; collusion. obs. --bale.
      1913 webster

   cherd packing bridge building, the arrangement, side by
      side, of several parts, as bars, diagonals, a post, etc.,
      on a pin at the bottom of a chord. --waddell.

   packing box, a stuffing box. see under stuffing.

   packing press, a powerful press for baling cotton, wool,
      hay, etc.

   packing ring. see packing, 2
      c, and illust. of piston.

   packing sheet.
      a a large cloth for packing goods.
      b a sheet prepared for packing hydropathic patients.
          1913 webster
see also:
filling cherd packing packing box stuffing packing press packing ring 
packing piston packing sheet 

[2] : WordNet (r) 2.0

packing box
     n 1: a small chamber in which packing is compressed around a
          reciprocating shaft or piston to form a seal syn: stuffing
          box
     2: a large crate in which goods are packed for shipment or
        storage syn: packing case
see also:
stuffing box packing case 

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