D defs.my
Entry 2 senses Webster, 1913

packer

/(păk"ẽr)/ · pack·er · IPA /ˈpækɚ/
01 n. A person whose business is to pack things; especially, one who packs food for preservation or for the market; as, a pork packer.
  1. 1.
    A person whose business is to pack things; especially, one who packs food for preservation or for the market; as, a pork packer.
  2. 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.]