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• n  newly formed outer wood lying between the cambium and the heartwood of a tree or woody plant; usually light colored; active in water conduction

• Sure, part of his job at the Washington Forest Protection Association was to stop the animals from stripping bark from trees and feeding on the sapwood.

News & Articles

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• MIT scientists show tree branch to be effective water purifier
  Brooks Hays BOSTON, Feb. 27 (UPI) -- MIT scientists found that a water filter made out of a small piece of sapwood can rid contaminated water of 99 percent of bacteria.
  Feb. 27, 2014 - UPI
• MIT researchers make a water filter from the sapwood in tree branches
  ( Massachusetts Institute of Technology ) MIT group shows xylem tissue in sapwood can filter bacteria from contaminated water.
  Feb. 26, 2014 - EurekAlert!
• Tree branch filters water
  ( PLOS ) A small piece of freshly cut sapwood can filter out more than 99 percent of the bacteria E. coli from water.
  Feb. 26, 2014 - EurekAlert!