heartwood

[hahrt-wood]
noun
the hard central wood of the trunk of an exogenous tree; duramen.

Origin:
1795–1805; heart + wood1

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Collins
World English Dictionary
heartwood (ˈhɑːtˌwʊd)
 
n
Compare sapwood the central core of dark hard wood in tree trunks, consisting of nonfunctioning xylem tissue that has become blocked with resins, tannins, and oils

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
heartwood   (härt'wd')  Pronunciation Key 
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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Example sentences
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.
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