Sap-wood

sapwood

[sap-wood]
noun Botany.
the softer part of the wood between the inner bark and the heartwood.
Also called alburnum.


Origin:
1785–95; sap1 + wood1

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Collins
World English Dictionary
sapwood (ˈsæpˌwʊd)
 
n
Compare heartwood the soft wood, just beneath the bark in tree trunks, that consists of living tissue

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sapwood   (sāp'wd')  Pronunciation Key 
The younger layers of new wood produced by the interior side of the vascular cambium within a tree trunk. Sapwood is active in the conduction of water and is usually lighter in color than heartwood.
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