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

packer \pack"er\ pa^k"~er, n.
   1. a person whose business is to pack things; especially, one
      who packs food for preservation or for the market; as, a
      pork packer.
      1913 webster

   2. a ring of packing or a special device to render gas-tight
      and water-tight the space between the tubing and bore of
      an oil well. u. s.
      webster 1913 suppl.

[2] : WordNet (r) 2.0

packer
     n 1: a workman employed to pack things into containers syn: bagger,
           boxer
     2: a wholesaler in the meat-packing business syn: meat packer
     3: a hiker who wears a backpack syn: backpacker
see also:
bagger boxer meat packer backpacker 

Packer >> P Words
Packer, definition of term: Packer
packer_pag1.html