sapwood

/หˆsapwสŠd/

IPA: /S AE1 P W UH0 D/

noun
  1. 1

    The wood just under the bark of a stem or branch, different in color from the heartwood.

    โ€œA popular myth is that sapwood is not as strong as heartwood.โ€

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Source: https://en.wiktionary.org/wiki/sapwood