noun. newly formed outer wood lying between the cambium and the heartwood of a tree or woody plant; usually light colored; active in water conduction.
1. Noun, singular or mass Its sapwood may be white to pale yellow while its heartwood ranges from light yellow to light orange that turns to a golden brown when exposed to air and light. 2. Adjective The restaurant and tavern features walnut sapwood tables and hand-hewn chestnut walls; three meals a day are served, with breakfast included in the rate.