cambium
/ˈkæmbiəm/
noun
- A layer of tissue in trees and other plants that produces new cells, making the stem or trunk grow thicker.
- Gardeners know that damaging the cambium can kill a tree because it stops the flow of nutrients.
- The cambium is responsible for the annual growth rings in a tree trunk.
- When you peel bark from a tree, you can see the greenish cambium layer underneath.