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The Collaborative International Dictionary
duramen

Heartwood \Heart"wood`\ (h[aum]rt"w[oo^]d`), 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.

Wiktionary
duramen

n. (context botany English) heartwood

WordNet
duramen

n. the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood [syn: heartwood]

Wikipedia
Duramen
  1. redirect Wood#Heartwood and sapwood

Usage examples of "duramen".

The wood of the tree, in comparison with the bark, is relatively poor in silex, the duramen of an old tree giving only 2.