Heartwood

//ˈhɑɹtˌwʊd// noun

Definitions

Noun
  1. 1
    The wood nearer the heart of a stem or branch, different in color from the sapwood. countable, uncountable

    "A popular myth is that heartwood is stronger than sapwood."

  2. 2
    the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood wordnet

Etymology

From heart + wood.

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