noun
bast
BAST/bˈæst/
Strong fiber from the inner bark of plants.
Strips of bast are twisted into cord beside the peeled bark.

Etymology
Old English bæst already named fibrous inner bark, the material used for cordage and mats. Its deeper origin is uncertain.
In context
first the bird works its way through the bark underneath lies the bast where cells transport sugar solution
More examples
- Strips of bast were taken from the inner bark.
- The basket was woven with strong bast fibers.
- The exhibit explained how bast was prepared.
Forms
bast