alburnumEtymologyFrom Latin alburnum, from albus (“white”), since it is often paler in color than the heartwood.alburnum means sapwood; the soft, newer wood in the trunk of a tree found between the bark and the hardened heartwood. Lexicurio rates it Sui generis — a strength score of 89 out of 100.nounsapwood; the soft, newer wood in the trunk of a tree found between the bark and the hardened heartwood.