Heartwood

Definition

noun

The central wood in a branch or stem characterized by being composed of dead cells, more resistant to decay, generally darker and harder than the outer wood.


Supplement

The heartwood in comparison with sapwood is darker and harder as a result of the deposition of chemical substances such as gums, tannins, or pigments that may impart such colour. Because of that the heartwood is primarily important to plants for structural support.


Compare: sapwood


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