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1. WordNet® 3.0 (2006)
duramen
    n 1: the older inactive central wood of a tree or woody plant;
         usually darker and denser than the surrounding sapwood
         [syn: heartwood, duramen]

2. The Collaborative International Dictionary of English v.0.48
Duramen \Du*ra"men\, n. [L., hardness, a hardened, i. e.,
   ligneous, vine branch, fr. durare to harden. See Dure.]
   (Bot.)
   The heartwood of an exogenous tree.
   [1913 Webster]

3. The Collaborative International Dictionary of English v.0.48
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.
   [1913 Webster]

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