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sapwood

[sap-woo d] /ˈsæpˌwʊd/
noun, Botany
1.
the softer part of the wood between the inner bark and the heartwood.
Also called alburnum.
Origin
1785-1795
1785-95; sap1 + wood1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sap-wood

sapwood

/ˈsæpˌwʊd/
noun
1.
the soft wood, just beneath the bark in tree trunks, that consists of living tissue Compare heartwood
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sap-wood in Science
sapwood
  (sāp'wd')   
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 Article for sap-wood

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

Learn more about sapwood with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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