'packthread' definitions:

Definition of 'packthread'

(from WordNet)
noun
A strong three-ply twine used to sew or tie packages

Definition of 'packthread'

From: GCIDE
  • packthread \packthread\, pack thread \pack thread\n. A strong three-ply thread or small twine used to sew or tie packs or packages. [WordNet 1.5]