Dictionary

heartwood

noun heart·wood \-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
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First Known Use of HEARTWOOD

1810
HEARTWOOD Defined for Kids

heartwood

noun heart·wood \ˈhärt-ˌwd\

Definition of HEARTWOOD for Kids

:  the usually dark wood in the center of a tree

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