Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by origin]
6. biological material
7. plant material
8. [wood and wood by product]
9. wood (plant material)
10. [wood by form or function]

Anotations

Scope note:

Areas of tree growth where the grain has grown in a deformed manner, such as in small knots from dormant buds, forming rounded outgrowths on a tree trunk or branch and wavy and circular patterns in timber and veneer.