(definition) by Webster 1913 Wed Dec 22 1999 at 0:05:33

Heart"wood` (?), 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 softer sapwood or alburnum.

 

© Webster 1913.

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