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  3. Materials Facet
  4. Materials (hierarchy name)
  5. materials (substances)
  6. [materials by origin]
  7. biological material
  8. plant material
  9. [wood and wood by product]
  10. wood (plant material)
  11. [wood by form or function]
  12. sapwood
Scope note
The thin, lighter colored, softer outer layer of more recently formed wood that lies between the bark and the heartwood.
Accepted term: 15-Jul-2024