Hypertext Webster Gateway: "sapwood"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sapwood \Sap"wood`\, n. (Bot.)
The alburnum, or part of the wood of any exogenous tree next
to the bark, being that portion of the tree through which the
sap flows most freely; -- distinguished from {heartwood}.
From WordNet (r) 1.7 (wn)
sapwood
n : newly formed outer wood lying between the cambium and the
heartwood of a tree or woody plant; usually light
colored; active in water conduction
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