1. the sapwood of a tree, consisting of the younger, outer layers of wood that conduct water and nutrients
Usage: botanical; technical

Examples

• The alburnum appears lighter in color than the darker heartwood at the center of the trunk.
• Water and minerals travel through the alburnum from the roots to the leaves.
• Woodworkers often distinguish between the alburnum and the more durable heartwood.
• The alburnum contains living cells that help transport nutrients throughout the tree.
• In cross-section, you can clearly see the boundary between the alburnum and heartwood.
• The alburnum is typically softer and more porous than the inner wood.