from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. sapwood; the thin white layer between the bark and wood of a tree
from the GNU version of the Collaborative International Dictionary of English
- n. The white and softer part of wood, between the inner bark and the hard wood or duramen; sapwood.
from The Century Dictionary and Cyclopedia
- n. The lighter-colored and softer part of the wood of exogenous plants, between the inner bark and the heart-wood.
From Latin alburnum, from albus ("white"). (Wiktionary)