heartwood

heartwood
/hahrt"wood'/, n.
the hard central wood of the trunk of an exogenous tree; duramen.
[1795-1805; HEART + WOOD1]

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Dead, central wood of trees.

Its cells usually contain tannins or other substances that make it dark and sometimes fragrant. Heartwood is mechanically strong, resistant to decay, and less easily penetrated by wood-preservative chemicals than other types of wood. One or more layers of living and functional sapwood cells are periodically converted to heartwood.

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▪ plant anatomy
also called  duramen 

      dead, central wood of trees. Its cells usually contain tannins or other substances that make it dark in colour and sometimes aromatic. Heartwood is mechanically strong, resistant to decay, and less easily penetrated by wood-preservative chemicals than other types of wood. One or more layers of living and functional sapwood cells are periodically converted to heartwood. See also sapwood; xylem.

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Universalium. 2010.

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  • Heartwood — Heart wood (h[aum]rt w[oo^]d ), n. The hard, central part of the trunk of a tree, consisting of the old and matured wood, and usually differing in color from the outer layers. It is technically known as {duramen}, and distinguished from the… …   The Collaborative International Dictionary of English

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