Sapwood definitions

săp'wo͝od'
The newly formed outer wood located just inside the vascular cambium of a tree trunk and active in the conduction of water. Sapwood is usually lighter in color than heartwood.
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The soft wood between the inner bark of a tree and the heartwood, serving to conduct water and sap.
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The newly formed outer wood located just inside the vascular cambium of a tree trunk and active in the conduction of water. Sapwood is usually lighter in color than heartwood.
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The younger layers of new wood produced by the interior side of the vascular cambium within a tree trunk. Sapwood is active in the conduction of water and is usually lighter in color than heartwood.
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The wood just under the bark of a stem or branch, different in color from the heartwood.

A popular myth is that sapwood is not as strong as heartwood.

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Origin of sapwood

From sap +"Ž wood.