HEARTWOOD
heartwood, duramen
(noun) the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood
Source: WordNet® 3.1
Etymology
Noun
heartwood (countable and uncountable, plural heartwoods)
The wood nearer the heart of a stem or branch, different in color from the sapwood
Source: Wiktionary
Heart"wood`, n.
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition
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