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heartwood

[hahrt-woo d] /ˈhɑrtˌwʊd/
noun
1.
the hard central wood of the trunk of an exogenous tree; duramen.
Origin
1795-1805
1795-1805; heart + wood1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for heartwood
  • Its branches were on fire, but authorities planned to drop water today to keep flames from reaching the heartwood.
  • heartwood is non-living and develops in the center of the tree as the tree grows.
  • heartwood is the portion of the log extending from the pith to the sapwood.
  • Exposed wood must be of heartwood or sapwood from redwood, cedar or other decay and termite resistant wood or treated wood.
  • Borers may feed in terminal shoots or burrow beneath the bark, or deep in the heartwood.
  • The heartwood is dead wood, but it used to be live sapwood.
  • The heartwood's main job is to provide support for the tree.
  • The heartwood is light brown to tan or reddish brown.
  • Sapwood and heartwood make up the bulk of the tree trunk.
  • The springwood pores are large and are completely occluded with tyloses in the heartwood.
British Dictionary definitions for heartwood

heartwood

/ˈhɑːtˌwʊd/
noun
1.
the central core of dark hard wood in tree trunks, consisting of nonfunctioning xylem tissue that has become blocked with resins, tannins, and oils Compare sapwood
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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heartwood in Science
heartwood
  (härt'wd')   
The older, nonliving central wood of a tree or woody plant, usually darker and harder than the younger sapwood. Unlike the sapwood, it no longer conducts water, and its main function is the support of the tree.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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16
15
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