What are the lines on wood called?

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Tags

  1. #known
  2. #parallel
  3. #structure
  4. #tubes
  5. #through
  6. #forming
  7. #trunk
  8. #running
  9. #inner
  10. #lines
  11. #grain
  12. #vertically
  13. #inside
  14. #formed
  15. #xylem