Sapwood n. (Bot.) The alburnum, or part of the wood of any exogenous tree next to the bark, being that portion of the tree through which the sap flows most freely; distinguished from heartwood.
... years this timber has also been put to another use—that of producing tan. When used for this purpose, the tree was cut down, its outer sapwood removed, and then taken to the river to be finally shipped to the United States ... — Argentina From A British Point Of View • Various
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