GNU Collaborative International Dictionary of English

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Found one definition

1.       
   packer (păkˈẽr), 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.]