Heartwood meaning

härt'wo͝od'
The older, nonliving central wood of a tree or shrub, usually darker and harder than the younger sapwood.
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The hard, nonliving, older wood at the core of a tree trunk, usually dark in color and impervious to air and water; duramen.
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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.
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The wood nearer the heart of a stem or branch, different in color from the sapwood.

A popular myth is that heartwood is stronger than sapwood.

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