Packer \Pack"er\, n. 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.]
Source: Webster's Revised Unabridged Dictionary (1913)
Packer \Pack"er\, n. A person whose business is to pack things; especially, one who packs food for preservation; as, a pork packer.