packer

Etymology

From Middle English pakker, pakkere, packare, equivalent to pack + -er.

noun

1. A person whose business is to pack things; especially, one who packs food for preservation
   He works as a pork packer.
   a household goods packer
   When his back problems kept him from lifting furniture, his skill as a packer kept him employed.
   1. Clipping of meatpacker.
2. (computing) A software program that compresses code or data.
   Many times, the malware authors will use packers and even encryption tools to disguise their software […] 2009, Harlan Carvey, Windows Forensic Analysis DVD Toolkit
3. (US) A ring of packing or a special device to render gastight and watertight the space between the tubing and bore of an oil well.
4. (LGBT) An artificial penis or similar object worn by a drag king, trans man, etc., inside the trousers.
5. (New Zealand) An object inserted to hold a space open for the purpose of alignment; a spacer or shim.
6. (dated) A kind of trunk for luggage.
7. (Australia) A packhorse.