Hypertext Webster Gateway: "heartwood"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Heartwood \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.
From WordNet (r) 1.7 (wn)
n : the older inactive central wood of a tree or woody plant;
usually darker and denser than the surrounding sapwood
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