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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

sapwood

outer, living layers of the secondary wood of trees, which engage in transport of water and minerals to the crown of the tree. The cells therefore contain more water and lack the deposits of darkly staining chemical substances commonly found in heartwood. Sapwood is thus paler and softer than heartwood and can usually be distinguished in cross sections, as in tree stumps, although the proportions and distinctness of the two types are variable in different species

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Sapwood is the layer of wood inside the bark and cambium that contains living
  xylem cells and is physiologically active.
The width of the sapwood varies with species and tree vigor.
Sapwood and heartwood make up the bulk of the tree trunk.
Sapwood is usually lighter in color, but it darkens with age and becomes
  heartwood.
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