outer wood (xylem) that contains living cells and is active in longitudinal transport of water and solutes (contrast with heartwood).

Merriam-Webster Online Dictionary
sapwood (noun)
the younger softer living or physiologically active outer portion of wood that lies between the cambium and the heartwood and is more permeable, less durable, and usually lighter in color than the heartwood
sapwood (Wikipedia)

Sapwood may refer to:

  • Sapwood (wood), the part of living wood where sap flows, as distinct from the heartwood, where it doesn't
  • SS-6 Sapwood, the NATO reporting name for the R-7 Semyorka intercontinental ballistic missile
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