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The Collaborative International Dictionary of English v.0.48 (gcide)

packer \pack"er\ (p[a^]k"[~e]r), 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.]