pack·thread 
(păkthrĕd′)
(păkthrĕd′)n.
A strong two-ply or three-ply twine for sewing or tying packages or bundles.
- three-mile limit
- three-peat
- threepence
- threepenny
- three-piece
- three-ply
- three-point landing
- three-point line
- three-quarter
- three-quarter binding
- three-ring circus
- three R's
- threescore
- three sheets in the wind
- three sheets to/in the wind
- three sheets to the wind
- Three Sisters
- threesome
- three-square
- three squares a day
- three-toed sloth
- three way
- three-way
- three-wheeler
- thremmatology