Etymology

alburnum

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Today it means: sapwood; the soft, newer wood in the trunk of a tree found between the bark and the hardened heartwood. Full definition →

Latin alburnum
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The story

  1. Latin · borrowed fromalburnum
  2. English todayalburnum

From Latin alburnum, from albus (“white”), since it is often paler in color than the heartwood.

Etymology from Wiktionary, CC BY-SA 4.0.