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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