heartwood

Noun
  1. The older inactive central wood of a tree or woody plant;
    Usually darker and denser than the surrounding sapwood (synset 113118511)
    is a type of: wood - the hard fibrous lignified substance under the bark of trees
    substance meronym: tree - a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms
    same as: duramen

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