alburnum
/ælˈbɜrnəm/
noun
- The soft, light-colored outer layer of wood in a tree, located just under the bark; also called sapwood.
- When you cut into a tree trunk, the pale alburnum is the layer that carries water and nutrients upward.
- The carpenter explained that alburnum is softer and more prone to decay than heartwood.
- In older trees, the alburnum is usually thinner than the darker heartwood at the center.
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