Definition of sapwood noun from the Oxford Advanced Learner's Dictionary

 

sapwood

 noun
noun
BrE BrE//ˈsæpwʊd//
 
; NAmE NAmE//ˈsæpwʊd//
 
[uncountable]
 
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the soft younger outer layers of the wood of a tree, inside the bark compare heartwood
See the Oxford Advanced American Dictionary entry: sapwood