heartwood


heart·wood

noun \-ˌwd\

Definition of HEARTWOOD

:  the older harder nonliving central wood of trees that is usually darker, denser, less permeable, and more durable than the surrounding sapwood

First Known Use of HEARTWOOD

1810

heartwood

noun    (Concise Encyclopedia)

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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