sapwood

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sap·wood / ˈsapˌwoŏd/ • n. the soft outer layers of recently formed wood between the heartwood and the bark, containing the functioning vascular tissue.

sapwood

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sapwood (alburnum) The outer wood of a tree trunk or branch. It consists of living xylem cells, which both conduct water and provide structural support. Compare heartwood.

sapwood

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sapwood The active xylem cells, which are peripheral to the dead, woody centre of the trunks of trees. This part of the xylem is distinguished easily from the central heartwood by its colour.