sap·wood

[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) [Click for IPA pronunciation guide]
 
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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00:10
Sapwood is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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
Free of heart center means that the post is cut from the heartwood or sapwood
  with the pith excluded.
Sapwood and heartwood make up the bulk of the tree trunk.
The heartwood is dead wood, but it used to be live sapwood.
Increment coring will be used to estimate sapwood area and leaf area index of
  stands.
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